Over three million MOT tests are conducted in the UK each year, with approximately 35-40% resulting in an initial failure. Understanding the most common MOT failure reasons and which vehicles fail most often helps you prepare your car and avoid joining the failure statistics. ## MOT Test Overview The MOT test is an annual inspection that checks vehicle safety, roadworthiness, and emissions compliance. As of April 2026, the maximum fee for a car MOT is £54.85. Tests can be conducted up to one month before the current certificate expires without losing the existing renewal date. The MOT test covers around 75 different vehicle checks across multiple categories including brakes, steering, suspension, tyres, lights, emissions, bodywork, exhaust, seats, seatbelts, windscreen, and more. A vehicle must pass all checks to receive an MOT certificate. Failed items are categorised as dangerous, major, or minor. Dangerous and major failures result in test failure and a refusal of the MOT certificate. Minor defects are recorded but do not prevent a pass, though they should be repaired soon. ## Top 10 Most Common MOT Failures **Tyres** consistently top the MOT failure charts, responsible for around 250,000 failures annually. Tyres are checked for tread depth below the legal minimum of 1.6mm, visible cuts or bulges, and proper inflation. Tyre pressure monitoring system warnings also count as failures. **Lights and signalling** cause approximately 200,000 annual failures. Broken or failed bulbs, damaged light units, incorrect headlight aim, and non-functional indicators all cause failures. Many light failures are easily preventable with regular checks. **Brakes** are the third most common failure category with around 150,000 failures. Issues include worn brake pads or shoes below safe limits, corroded brake pipes, faulty handbrake mechanism, and ABS warning lights illuminated. **Driver's view of the road** causes over 100,000 failures. Cracked or damaged windscreens within the driver's line of sight, excessive chip damage in the area the wiper sweeps, defective wipers, and broken rear-view mirrors all contribute. **Suspension** components cause approximately 100,000 failures. Worn or broken suspension components, excessive corrosion of suspension parts, and defective shock absorbers are common issues. **Exhaust and emissions** failures number around 80,000 annually. Diesel vehicles failing smoke opacity tests, excessive CO emissions from petrol cars, missing exhaust components, and exhaust gas leaks are typical problems. **Steering** failures number around 60,000 per year. Excessive play in the steering mechanism, damaged or corroded steering components, and power steering faults all cause failures. **Body and structure** causes approximately 50,000 failures. Excessive corrosion in structural areas, sharp edges that could injure pedestrians, and damaged door latches are common issues. **Tow bars and trailer attachments** cause increasing numbers of failures as more cars are fitted with them. Insecure attachments, damaged electrical sockets, and non-functional lights on trailers contribute. **Seatbelts** failures number around 30,000. These include seatbelts that do not retract properly, damaged webbing, failed pretensioners, and warning lights for seatbelt faults. ## Vehicles With Highest Failure Rates Brand new vehicles approaching their first MOT at three years old have the lowest failure rates, typically below 5%. As vehicles age, failure rates increase, with cars between seven and ten years old showing the highest failure rates at 45-55%. Among brands, certain manufacturers consistently show above-average failure rates. Budget and value-oriented brands often have higher failure rates than premium manufacturers, reflecting the quality of components and build standards. Among specific models, some vehicles consistently perform poorly. The data varies year by year, but budget city cars and older MPVs frequently appear in the top failure lists. Conversely, certain Toyota, Lexus, and Porsche models consistently achieve very low failure rates. Electric vehicles tend to have very low MOT failure rates, primarily because they have fewer mechanical components that can fail. The main areas where EVs fail mirror the general population: tyres, lights, and suspension. ## How to Reduce Your Risk of MOT Failure **Pre-MOT check** is the most effective strategy. Many garages offer pre-MOT inspections that identify faults before the official test, allowing repairs at your convenience rather than requiring retest at short notice. **Check lights yourself** every week. Walk around the vehicle with all lights operating and replace any failed bulbs immediately. Carry spare bulbs for common types. **Monitor tyre condition** monthly. Check tread depth, look for cuts or bulges, and ensure tyres are properly inflated. Replace tyres before they reach the legal minimum. **Listen for unusual noises** from brakes and suspension. Squeaking or grinding when braking, knocking over bumps, and excessive vibration all indicate problems that will likely cause MOT failure. **Address warning lights** before the MOT. An illuminated engine management light, ABS warning, or airbag light will cause automatic failure. Have diagnostic checks performed if any warning light appears. **Maintain fluid levels**, particularly brake fluid which degrades over time. Low brake fluid can indicate wear in the brake system. **Choose the right MOT centre**. VOSA allows any registered MOT centre to test any vehicle, so you are not restricted to the nearest option. Look for centres with good reputations, clear pricing, and honest assessments. ## Frequently Asked Questions **Can I drive my car if it fails its MOT?** You cannot drive on a public road if your MOT has expired or if the vehicle has dangerous faults. If your MOT has failed, you can drive to have repairs done or to a pre-arranged retest, but the vehicle must be safe to drive. Insurance may not cover you if you knowingly drive an unroadworthy vehicle. **What is a retest grace period?** If your vehicle fails its MOT, you have ten working days to have it repaired and presented for retest without paying an additional full test fee. The retest is free if the vehicle is left at the same test centre and the retest is completed within ten working days. **How long do MOT certificates last?** MOT certificates are valid for one year from the test date. You can present your vehicle for its next MOT up to one month before the current certificate expires without losing any time on the renewal date. **Are there any changes to MOT in 2026?** The MOT fee increased in April 2026 to £54.85 for cars. The test criteria have remained broadly consistent, though tighter emissions standards continue to apply. Always check the DVSA website for the latest MOT requirements and fees.