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Mileage Check Using MOT Records: Is the Odometer Telling the Truth?

Spot mileage drops, odd jumps and long stalls in the MOT record, with the trend drawn on a chart.

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Every MOT test records the odometer reading, and those readings form a dated trail that is hard to rewrite after the fact. That is the basis of an MOT history mileage check: line the readings up in date order, plot them, and see whether they tell a believable story. Enter a registration in the checker above and MOT Check Now charts every recorded reading and flags any that fall, jump sharply or barely move. This page explains what those flags mean, how to do the arithmetic yourself, and what to do if the numbers do not add up. For the wider test record, see the MOT history page.

This is the page for “MOT history mileage check”, “check mileage by reg” and odometer history questions. It uses MOT records only, so it can flag a fall, a big jump or a stall between tests, but it cannot prove clocking. See the full MOT history for the tests behind each reading.

01

Quick answers

  • What does it use? The odometer reading recorded at each MOT test, from the DVSA MOT history service.
  • What does it flag? Readings that fall, jump sharply or barely move between tests.
  • Does a flag prove clocking? No. It is an indicator from our own analysis. Typing errors, unit mix-ups and replaced clusters also cause flags.
  • Does a clean chart prove honesty? No. Mileage can be altered before the first test or between tests.
  • What should I do with a flag? Ask the seller for evidence such as service invoices and old MOT certificates.
  • Cost? The chart and flags are free.
02

Key facts at a glance

Question Short answer
Data source DVSA MOT history service
Coverage Tests in England, Scotland and Wales since 2005. Northern Ireland is a separate service run by DVA
Fields used Test date, odometer value, unit (MI or KM), result type (READ or NO_ODOMETER), test number
Flags Fall, big jump, long stall
Frequency of readings Once per test, so usually about a year apart
Nothing shown for Vehicles with no tests yet, such as new cars before their first MOT
What it is An indicator of consistency, not proof of clocking
Owner details Never shown
03

How recorded MOT mileage works

At each MOT the tester records the odometer reading. In the official data each test carries an odometer value, a unit (miles or kilometres) and a result type. The result type is READ when a reading was taken, or NO_ODOMETER when the vehicle has none. Because each reading is attached to a test date and a unique test number, you get a series of snapshots over the vehicle’s life.

Between tests, nobody records anything. The mileage trail is therefore a set of points, usually about a year apart, and everything in between is inferred. That is enough to catch many problems, and it is also why a mileage check can be wrong in both directions.

04

What clocking is and how MOT history helps

Clocking means winding back or altering an odometer so a vehicle appears to have covered fewer miles than it really has. A lower reading makes a car look newer and worth more, which is the reason sellers do it. Modern odometers are digital, and the reading can be changed with the right equipment, so a dashboard figure on its own proves nothing.

MOT history helps because the earlier readings were recorded by other people, at other times, long before the car was for sale. If the dashboard now shows fewer miles than a test recorded two years ago, one of the two is wrong. A seller can alter an instrument cluster, but cannot easily change what independent testers recorded years earlier.

05

How to use the mileage check

  1. Enter the registration. The mileage chart appears with the history.
  2. Read the chart left to right. The line should climb steadily.
  3. Check the flags. Any flag is listed against the test it relates to.
  4. Compare the latest reading with the dashboard. The current odometer must be higher than the last recorded MOT reading, and by a sensible amount for the time since.
  5. Ask about anything unexplained. A good seller will have an answer and often a document.
06

The flags explained in plain terms

Our mileage analysis looks at the recorded odometer readings in test-date order and highlights three patterns. These are indicators from our own analysis of the official data. They are not findings of fraud.

A fall

A fall means a later test recorded a lower reading than an earlier one. In a vehicle with a working odometer, the number can only rise. A fall can mean the odometer was wound back. It can also mean the earlier reading was mistyped, the later one was, or the unit was recorded wrongly. For example, a reading in kilometres entered as miles will look like a fall or a jump depending on which way the error went.

A big jump

A big jump means the vehicle recorded far more miles between two tests than its usual pattern. Genuine reasons exist: a change of job, a long trip, a move abroad and back, or a switch to using the car for commercial work. A jump can also reveal an earlier typing error that is now corrected, or a reading that was too low at the earlier test. Look at the readings either side to see which one looks out of line.

A long stall

A stall means the reading barely changes across a long period. A car in storage, kept off the road, or used very little will show a stall. So will a vehicle whose odometer stopped working or was disconnected, and in that case the stall may be followed by a catch-up. If tests show almost no mileage over several years but the car was taxed and used, ask why.

Flag What the data shows Innocent explanations Worrying explanations
Fall A later reading is lower than an earlier one Typing error, wrong unit, odometer replaced Odometer wound back
Big jump Much more distance than the vehicle’s usual pace Change in use, long trips, earlier low typing error Previous low reading was false
Stall Almost no change over a long period Storage, SORN, very low use Faulty or disconnected odometer, reading frozen
07

A worked example: reading a mileage chart

The following is an illustrative example using invented figures for an imaginary car. It shows how you read a chart and what the arithmetic looks like. Suppose six consecutive MOT tests recorded these odometer readings:

Test year Reading (miles) Change since last test Comment
2019 12,000 First reading Starting point
2020 21,500 9,500 Normal pace
2021 29,800 8,300 Slightly lower, plausible
2022 41,000 11,200 Slightly higher, plausible
2023 32,500 Minus 8,500 A fall. Flagged
2024 41,200 8,700 Pace resumes from the lower figure
Illustrative example: recorded MOT mileage for an invented car 010,00020,00030,00040,000 2019 12,000 2020 21,500 2021 29,800 2022 41,000 2023 32,500 2024 41,200 Red point: a reading lower than the one before it (a fall of 8,500 miles). Invented data.
Illustrative example: a steady climb, then a fall in 2023 that a mileage check would flag. The figures are invented to show how to read the chart.

Look at what the chart tells you. For four tests the line climbs at a steady rate of roughly eight to eleven thousand miles a year. In 2023 it drops by 8,500 miles, and then it resumes climbing from the lower figure at a similar pace. That pattern is the one that deserves the most attention. If the 2023 figure was a typing error, the 2024 reading should have picked up from near 41,000 plus a normal year, which would be around 50,000. Instead, it carries on from the lower base, and the 2024 reading is almost exactly where the 2022 reading was. That is consistent with an odometer that was reset or wound back by about 8,500 miles. It is also consistent with an instrument cluster replaced with a unit that started from a lower figure. The chart cannot tell which, but it tells you exactly what to ask.

Using the method set out later on this page, the average pace over the first four tests is (41,000 minus 12,000) divided by three years, which is about 9,700 miles a year. Across the whole series the headline average would look lower because of the fall: (41,200 minus 12,000) divided by five years gives 5,840 miles a year. A buyer who only saw the average might think the car was lightly used. The year-by-year view shows something else.

A second example: a unit error

Now imagine a different car whose readings were 38,000, then 62,000, then 47,000. The jump to 62,000 looks huge and the drop to 47,000 looks like a fall. But 62,000 kilometres is roughly 38,500 miles, because one mile is about 1.6 kilometres. If a tester selected kilometres by mistake or the car is a recent import that was previously read in kilometres, the middle reading is simply in the wrong unit. The jump and the fall are the same single error showing up twice. This is why you should always check the unit before judging a flag.

08

How to calculate average annual mileage

You do not need any special tool to test whether the numbers are plausible. The method is simple.

  1. Pick two readings. Use the earliest and latest tests, or any two you want to compare.
  2. Subtract. Latest reading minus earlier reading gives the distance travelled.
  3. Work out the time. Count the years between the two test dates. Use months for short gaps, divided by 12.
  4. Divide. Distance divided by years gives the annual average for that period.
  5. Repeat for each interval. Do this test by test, so you see the yearly pattern rather than a single blended figure.

For example, if a test in March recorded 40,000 miles and the next test in March a year later recorded 49,000, the vehicle covered 9,000 miles that year. Suppose a later test recorded 52,000 and the next after that 51,000. The final interval is a fall of 1,000, which the checker would flag.

09

What is normal and what is not

This site does not publish a single national average, because the right comparison is the vehicle with itself. The most useful questions are about consistency rather than size.

  • Steady years are normal. If a car does around the same distance each year, the chart climbs in a line.
  • A change in pace needs a reason. Commuting, retirement, a job change, a house move and lockdowns all change the pace. Ask the seller what changed.
  • Low mileage for the age deserves checking, not celebrating. Very low mileage is attractive, so it is also the figure most worth verifying with service records and the condition of the interior, pedals and seat bolsters.
  • A different pace for the type of vehicle is expected. Vans, taxis and company cars cover distance differently from weekend cars.
  • The shape matters more than any single number. Sudden pace changes are more informative than a high or low total.

Fuel type affects the pattern too. Many diesels are bought for high mileage, and many petrol city cars for low. Compare like with like by checking the fuel type in the vehicle check.

10

Understanding units and missing readings

Miles and kilometres

The official data records each reading with a unit, MI for miles or KM for kilometres. A vehicle imported from abroad may have early readings in kilometres and later ones in miles after conversion. If a tester records the wrong unit, the number looks wrong by a factor of about 1.6. A fall or jump that matches that factor is likely a unit error. Convert before you judge it.

No odometer

Some vehicles have no odometer to read. The record then shows NO_ODOMETER for that test and no mileage figure. A test with no reading creates a gap in the chart rather than a zero, and it is the reason a chart can look sparse for older or specialist vehicles. Treat it as missing information.

Replaced instrument clusters

When a dashboard cluster is replaced, the new unit may start at a different figure. Genuine replacements are common and should come with paperwork. If a seller offers this explanation, ask for the invoice.

11
Pattern What you will see Common explanations What to ask
Steady climb A line rising at a similar rate each year Normal use Nothing unusual. Still verify the dashboard
Change of pace The line steepens or flattens permanently New job, retirement, house move, change of use What changed in the owner’s life?
Single fall One reading lower than the one before Typing error, unit error, odometer replaced or wound back Evidence for the lower figure
Isolated spike One reading far above the line, then back to trend Typing error with an extra digit Check the readings either side
Long stall Almost flat for a year or more Storage, SORN, very low use, faulty odometer Where was the car kept?
Gap with no test A missing year in the series Car off the road, exempt, or tested in another system Was it SORN? Where was it tested?
NO_ODOMETER A test with no figure Vehicle has no odometer Treat as missing information

A single odd point is rarely the whole story. Several oddities together, such as a fall, a missing year and repeated failures, are more worrying than any one alone. Read the chart alongside the full test record on MOT history and use the advisory tracker to see whether worn parts have been replaced or left. A car showing very low mileage but advisories for worn suspension or a badly worn pedal rubber is telling you two things that do not sit easily together.

MOT timeline for a vehicle Timeline showing registration, first MOT by the third anniversary, then an MOT every 12 months, with the early test window of one month minus one day that keeps the same renewal date. Your vehicle's MOT timeline From registration to every yearly testDay 0RegisteredVehicle isfirst registeredYear 3First MOTDue by the 3rdanniversary ofregistrationYear 4Next MOT12 months afterthe previous oneYear 5+Every yearRepeat MOTevery 12 monthsEarly test windowTest up to one month minus one day before expiryand keep the same renewal date.Some vehicle types need their first MOT at 1 year.Source: GOV.UK
When a new car needs its first MOT and how the cycle repeats
12

Converting miles and kilometres

The conversion you need is simple: one mile is about 1.6 kilometres, so divide a kilometre figure by 1.6 to get miles, or multiply miles by 1.6 to get kilometres. A few reference points help you recognise a unit error on sight.

Kilometres Approximate miles
10,000 6,200
50,000 31,100
100,000 62,100
160,000 99,400

If a fall or a jump matches this ratio, a unit error is the first thing to suspect. Imported vehicles often have a kilometre history that continues in miles after registration in the UK, and a tester working quickly can choose the wrong unit. The official data stores the unit alongside each reading as MI or KM, which is why we show it.

13

Limits of a mileage check

  • A flag is an indicator, not proof. Typing mistakes, unit mix-ups and replaced clusters all produce flags without any dishonesty.
  • A clean chart is not proof either. Mileage can be altered before the earliest test, or between two tests without a visible break.
  • Readings are annual. We cannot see what happened between tests.
  • Coverage is limited. The data covers tests in England, Scotland and Wales since 2005. Northern Ireland tests are held by DVA, a separate service, and are not included. Vehicles under three years old may have no tests yet.
  • Odometer values come from testers. They are recorded by people, so occasional errors exist.

Treat the mileage check as a prompt to ask questions. It cannot tell you whether a car was clocked. It can tell you whether the figures are consistent.

14

Edge cases that change how you read the chart

New and nearly new cars

A new car has no MOT readings until its first test, which is due by the third anniversary of registration. A vehicle that is a year or two old will show details but no mileage trail. For cars at this age, rely on the service book, the dealer history and the V5C, and use the vehicle check to confirm the registration date. See our first MOT guide for the timing.

Cars with a gap in their testing

A missing year can mean the car was off the road, perhaps under a SORN, or that it was exempt from testing for a period, or that tests took place somewhere the DVSA data does not cover. Check the SORN check for the current status and ask the seller about the missing period. A long gap followed by a normal reading is not worrying in itself. A long gap followed by a reading lower than the last one is.

Odometer faults and replaced clusters

Odometers fail, and instrument clusters are replaced after faults or accidents. A legitimate replacement should be documented, ideally with an invoice that records the old reading and the new unit. Without paperwork, a replaced cluster looks exactly like a wound-back one on the chart, which is why you ask for evidence.

Electric and hybrid vehicles

The odometer in an electric or hybrid car works the same way for the purposes of the MOT record, and the same checks apply. Digital dashboards can be reprogrammed, so a dashboard figure on its own proves nothing, and the independent MOT readings remain the best check.

Vans, taxis and company cars

These vehicles often cover far more distance than private cars, so a high figure is normal. What matters is consistency across tests. A taxi that suddenly shows a very low pace may have changed use, while a van that jumps in mileage may have been put on a delivery round.

Older vehicles and exemptions

Vehicles that are exempt from the MOT, such as some historic vehicles, will show few or no test readings. A classic with no tests is not suspicious in itself, but it means the mileage trail cannot help you, and a physical inspection and any receipts matter more. The rules are in our MOT-exempt vehicles guide.

Northern Ireland and cross-border cars

Tests in Northern Ireland are run by DVA and are not in the DVSA data, so a car that has been tested on both sides of the Irish Sea may show a partial trail. See the Northern Ireland MOT guide.

15

Checking the dashboard against the last recorded reading

This is the single most useful comparison you can make at a viewing. Take the date and reading of the latest test, and note today’s date and the dashboard figure. The dashboard must be higher than the last recorded reading, and the difference should be reasonable for the time since. Here is an illustrative example. A car’s last test, six months ago, recorded 41,200 miles. A pace of around 8,700 miles a year suggests roughly 4,000 to 5,000 miles since. A dashboard showing 45,500 fits well. A dashboard showing 41,000 is lower than the last test and needs a documented explanation. A dashboard showing 58,000 suggests either unusual use or a mistake in an earlier record. In all cases the answer is the same: ask, and ask for evidence.

If you have an advert’s claimed mileage, the seller claim checker compares it with the official record, and the compare cars tool shows two candidates side by side. For the physical signs, such as pedal rubbers, steering wheel wear and a sagging driver’s seat bolster, use the used car checklist and look at the tyre condition with the tyre guide.

16

Clocking and the law

Altering an odometer to make a vehicle look lower-mileage and then selling it without telling the buyer is deceptive and can amount to an offence. There are legitimate reasons to repair or replace an odometer, but these should be disclosed. If you think you have been sold a clocked car, keep all the paperwork and messages, and speak to your local Trading Standards service. We cannot give legal advice, and a flag on our chart is not evidence that a crime has occurred.

How to check a car before buying Five-step checklist for checking a used car before buying: check MOT history, check mileage trend, check tax and SORN, inspect in person, and take a test drive. Checking a car before you buy Five steps, in order1Check the MOT historyLook for failures, repeated advisories and gaps between tests.2Check the mileage trendReadings should rise steadily. Falls or big jumps need an explanation.3Check tax and SORNConfirm the tax status. Tax is not transferred when a vehicle is sold.4Inspect it in personCheck it matches its details and look over bodywork, tyres and lights.5Take a test driveListen for noises and check how it brakes, steers and changes gear.Mileage flags are an indicator, not proof of clocking.Based on GOV.UK and DVSA data
A step-by-step route for checking a car before you buy
17

What to do if you see a discrepancy when buying

  1. Stay calm and look at the detail. Open the history and find the test where the reading changed. Check for a unit change or an obvious typo.
  2. Ask the seller directly. Request the explanation in writing or by message. A genuine seller will have one.
  3. Ask for evidence. Service invoices, previous MOT certificates, dealer stamps in the service book and invoices for a replaced cluster all help. Compare the mileage on each with the MOT readings.
  4. Check the car itself. Wear on the steering wheel, pedals, gearknob and driver’s seat should be consistent with the mileage shown. Our used car checklist includes these checks.
  5. Look at the rest of the history. Does the discrepancy sit alongside gaps, repeated failures or ignored advisories? Several oddities together are more worrying than one.
  6. Negotiate or walk away. If the explanation is thin and the evidence is missing, the safest choice is another car. If you proceed, price in the risk. If you think you have been sold a clocked car, speak to your local Trading Standards service.

If the mileage is the only unusual detail, the vehicle check and the guide to reading MOT history help you decide whether the rest of the car looks sound.

18

Questions to put to a seller about mileage

Having a script keeps the conversation calm and gives you something concrete to write down. Ask in a friendly tone and keep the answers.

  1. “How long have you owned the car, and roughly how many miles have you done a year?”
  2. “Is the mileage on the dashboard the true mileage? Has the odometer or instrument cluster ever been replaced or repaired?”
  3. “Do you have the service book and invoices that show the mileage at each service?”
  4. “Do you have any old MOT certificates, and can I see them?”
  5. “The MOT record shows a different figure in this year. Can you explain that?”

Compare the answers with the chart. A seller who has owned the car for years should be able to give a yearly figure that fits the line. A seller who has owned it a few weeks cannot vouch for what happened before, and the documents matter more. Never let enthusiasm or a bargain price stop you asking. If the answers are vague and the documents are missing, that is information too.

19

What an honest, healthy record looks like

It helps to know what you are hoping to find. A trustworthy record usually has a test every year without long gaps, readings that rise in a smooth line, a unit that stays the same, and advisories that are dealt with in later tests. It may still contain one or two harmless oddities, such as a single typo corrected the following year. What it should not contain is an unexplained fall followed by a continuing climb from the lower figure, or a long stall in a car that was clearly being used. You can see how repeated advisories behave across tests using the advisory tracker, and keep an eye on your own car with the car watchlist.

20

If you are the owner

The mileage record also protects you. A clear, steady trail is evidence of an honest history when you come to sell. If a recorded reading looks wrong on your own vehicle, such as a typo at a previous test, raise it with the test station that recorded it. Keep service invoices that show mileage, because they support your case. Use the MOT reminder to avoid missed tests, which leave gaps in the trail.

21

Glossary

  • Odometer: the instrument that records distance travelled.
  • Clocking: winding back or altering an odometer to show a lower distance.
  • READ: the result type meaning an odometer reading was taken at the test.
  • NO_ODOMETER: the result type meaning the vehicle has no odometer to read.
  • MI and KM: the units recorded with each reading, miles or kilometres.
  • Fall, jump and stall: the three patterns our analysis flags.
  • Instrument cluster: the dashboard unit that contains the odometer.
  • DVSA and DVA: the bodies that run MOT testing in Great Britain and Northern Ireland. We are not affiliated with either.
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Where to go next

For the whole picture, use the vehicle check and the car tax check. For the test records behind the readings, see MOT history and the historical MOT check. Learn how we handle data in how we get our data, and read the editorial policy to see how we describe our limits. Questions go to the contact page.

The mileage analysis in the paid report

The free mileage check shows the chart and flags. The Full Vehicle Report adds a written analysis of the readings and a plain-English risk summary, together with the full MOT timeline and recurring advisories, as a PDF for £3.99. It does not include finance, stolen or write-off data.

Full Vehicle Report (PDF)

Complete MOT timeline, mileage analysis, recurring advisories and a plain-English summary in one downloadable document.

£3.99Get the report

Mileage data comes from the DVSA MOT history service. MOT Check Now is independent and is not affiliated with the DVSA or DVLA. You can view the official record at GOV.UK. Contains public sector information licensed under the Open Government Licence v3.0.

Frequently asked questions

How does an MOT history mileage check work?

Every MOT test records the odometer reading with its date. The check puts those readings in date order, charts them and looks for readings that fall, jump sharply or barely change. Consistent, steadily rising readings are a good sign, while unexplained changes are worth questioning.

Can MOT history prove a car has been clocked?

No. A flag is an indicator from analysis of recorded readings, not proof. Typing errors, wrong units and replaced instrument clusters can also cause one. Treat a flag as a reason to ask the seller for evidence such as service invoices and old MOT certificates.

What does it mean if the mileage goes down between MOTs?

A later reading lower than an earlier one is the clearest warning sign, because an odometer normally only rises. Causes include a wound-back odometer, a mistyped reading or a recorded unit mix-up between miles and kilometres. Compare the readings either side and ask the seller to explain.

How do I work out average annual mileage from MOT history?

Subtract the earlier reading from the later one, then divide by the time between the two test dates in years. Repeat this for each pair of consecutive tests so you can see whether the pace is steady. Sudden changes in pace need an explanation.

What does NO_ODOMETER mean in MOT data?

It means the vehicle had no odometer to read at that test, so no mileage figure was recorded. It is missing information rather than a reading of zero. It leaves a gap in the mileage chart.

Why are some mileage readings in kilometres?

The official data records a unit with each reading, either miles or kilometres. Imported vehicles may have kilometre readings from earlier tests, or a tester may select the wrong unit. A kilometre figure is roughly 1.6 times the number of miles, so convert before judging a fall or jump.

Is a car with very low mileage for its age a bargain?

Not automatically. Low mileage is attractive, so it is the figure most worth verifying. Check that the MOT readings rise steadily, ask for service records and look at wear on the pedals, steering wheel and driver's seat to see whether it matches.

What should I do if the dashboard mileage is lower than the last MOT reading?

Do not buy until the seller gives a documented explanation, such as an invoice for a replaced instrument cluster. Check the units and the test records first. If no evidence supports the lower figure, walk away or speak to Trading Standards if you believe you were misled.

Is the mileage check free?

Yes. The mileage chart and the flags for falls, big jumps and long stalls are free. The paid Full Vehicle Report adds a written analysis of the readings, but it does not include finance, stolen or write-off data.

How often is mileage recorded?

Once at each MOT test, so usually about a year apart. Nothing is recorded between tests, which is why a chart cannot show what happened in between and why a clean chart is not proof of an honest history.

What if the car has no MOT history to chart?

A new car has no readings until its first MOT, and some older vehicles are exempt from testing. In those cases the chart cannot help, so rely on service records, the V5C and a physical inspection.

Where can I report a clocked car?

If you believe you have been sold a car with a wound-back odometer, keep all the paperwork and messages and speak to your local Trading Standards service. A flag on our chart is an indicator only and is not evidence of a crime.

More free checks

MOT CheckIs the MOT valid, when does it expire, how many days are left.MOT HistoryEvery test since 2005 with failures and advisories.Car Tax CheckTaxed, untaxed or SORN, and the tax due date.SORN CheckSee whether a vehicle is declared off the road.ULEZ CheckerLondon ULEZ compliance estimate and daily charge.Clean Air Zone CheckerBristol, Birmingham and other UK zones.Mileage CheckOdometer trend and clocking red flags.Vehicle CheckMake, colour, fuel, engine, CO2 and Euro status.MOT ReminderFree email reminder before your MOT runs out.Seller Claim CheckerCheck an advert's mileage, MOT date and details against the record.Advisory TrackerSee which advisories were fixed, ignored or became failures.Compare Two CarsPut two registrations side by side and see which has fewer concerns.Car WatchlistGet an email when a new MOT result or expiry is due for a car.

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