How to Read MOT History: What Every Used Car Buyer Should Check

Summary

• Free Government Data: MOT history is available free from gov.uk and shows every test since 2005.
• Spot Mileage Fraud: Compare MOT mileage readings year-on-year to detect odometer tampering.
• Use Advisories to Negotiate: Past and present advisories show wear patterns and upcoming costs. Check with our free MOT checker.

Every MOT test leaves a digital trail. This trail tells you more about a used car than any seller ever will.

MOT history reveals mileage fraud, recurring problems, accident damage, and neglected maintenance. Best of all? It's completely free to access.

Here's how to read it like a pro.

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What Is MOT History?

MOT history is the complete record of every MOT test a vehicle has undergone since 2005. It includes:

• Test dates: When each MOT was conducted
• Results: Pass, fail, or pass with advisories
• Mileage: Odometer reading at each test
• Advisories: Items that need monitoring
• Failure reasons: Why a car failed (if applicable)
• Dangerous defects: Serious safety issues found

This data is held by DVSA (Driver and Vehicle Standards Agency) and available to the public free of charge.

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How to Check a Car's MOT History

You have several options:

Option 1: CarOwl MOT Checker (Recommended)

Our free MOT checker shows:

• Complete MOT history with all advisories
• Clear mileage timeline
• Tax status and ULEZ compliance
• Option to upgrade to full history check

Option 2: Gov.uk

The official government service at gov.uk/check-mot-history provides raw MOT data.

What You Need

Just the vehicle registration number (number plate). That's it.

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Understanding MOT Results

MOT tests have several possible outcomes:

Defect Categories (Since 2018)

Modern MOT results classify defects by severity:

• Dangerous: Immediate road safety risk—fail
• Major: Significant safety or environmental issue—fail
• Minor: No significant effect on safety—pass with advisory
• Advisory: Could become problem in future—pass

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How to Spot Mileage Fraud Using MOT History

MOT history is your best weapon against odometer tampering. Here's how to use it:

Check the Mileage Timeline

Every MOT records the odometer reading. Look at them in sequence:

Red Flags for Mileage Fraud

• Mileage goes DOWN: Obvious clocking
• Mileage stays same for years: Unlikely to be genuine
• Huge jumps then small changes: May have been clocked back
• Missing years: Gaps could hide manipulation

Calculate Average Annual Mileage

UK average is about 7,000-8,000 miles per year. Calculate it:

• Total mileage ÷ age of car = average per year
• Significantly below average? Could be clocked
• Very high mileage? May indicate taxi/fleet use

If advertised mileage is lower than the last MOT reading, that's definitive proof of fraud.

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How to Read MOT Advisories

Advisories are items the tester noted but didn't cause a fail. They're goldmines of information.

Common Advisories and What They Mean

Using Advisories to Negotiate

Add up likely costs from advisories. Use this as negotiating leverage:

• Brake pads: £150
• Two tyres: £200
• Oil leak repair: £150
• Total: £500 off asking price

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Spotting Recurring Problems

Look at advisories across multiple years. Patterns reveal underlying issues:

Example: Suspension Problems

• 2021: "Front suspension arm worn"
• 2022: "Front shock absorber leaking"
• 2023: "Front suspension bush deteriorated"

Pattern: This car has ongoing front suspension issues. Expect more costs.

Example: Corrosion

• 2020: "Slight corrosion on rear sill"
• 2022: "Corrosion on rear sill and wheel arch"
• 2024: "Corrosion affecting structural integrity" (FAIL)

Pattern: Rust is spreading. Could become unfixable/uneconomical.

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What Failed MOTs Tell You

A failed MOT isn't necessarily bad—what matters is why it failed.

Minor Failures (Less Concerning)

• Bulb blown
• Wiper blade worn
• Number plate light out
• Tyre just below limit

These are cheap, quick fixes. Not a big deal.

Major Failures (More Concerning)

• Brake disc excessively worn
• Suspension component defective
• Exhaust emissions too high
• Steering rack worn

These cost more and may indicate neglected maintenance.

Serious Failures (Red Flags)

• Structural corrosion
• Chassis damage
• Major steering defect
• Brake system failure

These suggest accident damage, severe neglect, or the car reaching end-of-life.

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Gaps in MOT History: What They Mean

Missing MOT tests can indicate:

Legitimate Reasons

• Car was SORN: Off road and not requiring MOT
• Abroad: Vehicle was exported temporarily
• New car: First 3 years are MOT-exempt

Concerning Reasons

• Mileage hiding: Taken off road to gap the records
• Repair period: After accident damage
• Multiple owners: Changed hands frequently

A full vehicle history check can fill in gaps and reveal what happened during MOT-free periods.

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MOT History Checklist for Buyers

Before buying any used car, verify:

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MOT History vs Full Vehicle Check

MOT history is valuable but limited. Here's what else you need:

For complete peace of mind, run a full vehicle history check.

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The Bottom Line

MOT history is free and incredibly useful. Use it to:

1. Detect mileage fraud: Compare readings year-on-year
2. Spot recurring problems: Same issues = ongoing costs
3. Estimate upcoming costs: Advisories show what needs doing
4. Negotiate price: Use advisory costs as leverage
5. Understand the car's life: Failures and fixes tell a story

Start with our free MOT checker, then upgrade to a full history check for complete protection.

For more on what MOTs cover, see our ultimate MOT guide.

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