DVSA Reveals 566,000 Cars Failed MOT With a Dangerous Fault Costing Up to £300

• 566,187 cars and vans failed their MOT with at least one dangerous fault between April and June 2026, DVSA figures show, out of 7,808,594 tests.
• Tyres and brakes together account for roughly 95% of those dangerous faults, and fixing either can cost up to £300 before a retest is booked.
• Driving on with a dangerous fault risks a fine of up to £2,500 and 3 penalty points per defective tyre, and can leave a driver uninsured if a crash follows.

Nearly one in fourteen cars taken for an MOT in the second quarter of this year came away with a dangerous fault stamped on the certificate, according to figures the Driver and Vehicle Standards Agency has just published. Of the 7,808,594 Class 3 and 4 vehicles tested (the category covering ordinary cars and small vans), 566,187 had at least one defect serious enough to be marked dangerous, meaning the car should not be driven again until it is fixed. That is a 7.25% dangerous-fault rate, on top of an overall initial failure rate of 26.75% across every kind of fault, from a cracked headlamp lens to a snapped spring.

The DVSA breaks failures into three grades: minor, major and dangerous. A dangerous fault is the most serious of the three, meaning the vehicle has a direct and immediate risk to road safety or a serious impact on the environment. Two systems dominate the dangerous-fault list by a wide margin. Tyres carried a 4.64% dangerous-fault rate across all tests, and brakes carried a 2.27% rate, together accounting for roughly 95% of every dangerous fault recorded in the quarter. Suspension, at 0.44%, and steering, at 0.08%, trail a long way behind.

Why Tyres and Brakes Dominate the Dangerous List

The pattern is not new, but the scale is the story. A tyre becomes a dangerous fault when the tread drops below the legal minimum of 1.6mm across the central three quarters of the tyre and around its full circumference, when there is a cut or bulge exposing the tyre’s structure, or when the tyre is simply the wrong size or type for the vehicle. Brakes are marked dangerous when a tester finds a pipe close to failure, a disc worn through, or a handbrake that will not hold the car on a slope. Both faults share the same trait: they are often invisible from the driver’s seat until the car is already unsafe to stop or grip the road.

Fixing either fault is rarely free. A single replacement tyre typically costs somewhere between £45 for a budget brand and £120 for a mid-range one, so a full set can run to £400 for budget tyres or £700 for a mid-range or winter set, plus roughly £10 a wheel for balancing. Brake pads cost more to fit than to buy: a full axle of pads, including labour, typically runs from £120 to £300, and that climbs further if the discs need replacing too. A car that fails on both a tyre and a brake fault in the same test, which the DVSA figures suggest is common given how the two categories dominate the dangerous list, can leave its owner facing several hundred pounds of repair before the car is legal to drive again.

The DVSA’s own test fee adds a smaller but unavoidable cost on top. The maximum a garage can charge for a Class 4 car MOT is £54.85, a fee that has stayed frozen for well over a decade even as running a test centre has become more expensive. If a car is left at the same garage for repair and retested within ten working days, the garage cannot charge again for a partial retest covering only the failed items. Take the car away and bring it back, however, and a garage is entitled to charge a partial retest fee, and a full re-examination after the ten-day window costs the same as the original test.

None of this accounts for the cost of getting caught. Driving a car with a dangerous fault on a public road is a criminal offence in its own right, separate from the MOT itself. Each illegal tyre can carry a fine of up to £2,500 and 3 penalty points, meaning a car on four illegal tyres could theoretically expose a driver to a £10,000 fine and 12 points, but in practice police and courts use discretion rather than stacking penalties to that extreme. Defective brakes carry the same maximum fine and points under the Road Traffic Act’s construction and use rules. On top of the criminal penalty, an insurer can refuse to pay out on a claim if it can show the vehicle was in a dangerous condition and that condition contributed to the incident, which turns a repair bill into a total loss with no cover behind it.

The regional and seasonal pattern in dangerous faults is less visible in the DVSA’s own release, which reports failures nationally by defect category rather than by postcode or vehicle age. What the data does show clearly is the shape of the risk: tyres and brakes are wear items that fail gradually, and a car that has gone a year without anyone checking tread depth or listening for a grinding brake is the kind of car most likely to turn up on this list. The DVSA’s overall final failure rate, which counts a car as failed only if it left the test centre without being fixed, came in at 21.72% for the quarter, lower than the initial 26.75% rate: a meaningful share of cars are patched up on the spot and pass on the retest.

Can You Avoid It

The single most useful thing a driver can do is check tyre tread and brake feel before the MOT is due, not after. A 20 pence coin pushed into the main tread grooves is a rough but reliable test: if the outer band of the coin is still visible, the tyre is close to, or below, the legal limit and needs checking properly with a tread depth gauge. Tyres should be checked at more than one point around the circumference, as wear is rarely even, and on the inside edge and the outside: inner-edge wear from poor wheel alignment is easy to miss on a quick glance.

For brakes, the warning signs worth acting on immediately are a spongy or low pedal, a grinding or metallic noise when braking, the car pulling to one side under braking, or a handbrake that needs pulling further than it used to before it holds. A garage can check pad thickness and disc condition in minutes, usually for free or for a small diagnostic fee, well before a full MOT is due.

Timing the repair makes a financial and a legal difference. Booking an MOT with ten working days or more of slack before the certificate expires means that if the car does fail, there is time to get it fixed and back for a free partial retest at the same garage, rather than paying for a second full test elsewhere. Several tyre and service chains also run free tyre and brake checks throughout the year, independent of the MOT cycle, which can catch a developing dangerous fault months before the test is due and spread the cost of replacement rather than facing it all at once.

Buying tyres does not have to mean paying full price at the first garage that quotes. Prices for the same tyre size and brand can vary by £20 or more between fitters in the same town, and budget-range tyres from established manufacturers’ secondary brands often perform close to their premium siblings on tread wear and grip, at a meaningfully lower price, according to independent tyre testing bodies that regularly compare budget and premium ranges. For brakes, asking whether a garage is replacing pads alone or pads and discs together is worth doing before work starts. Discs do not need replacing every time pads do, and an honest garage will explain why a disc has or has not reached the point of needing to be changed.

Finally, a car that has just failed on a dangerous fault cannot legally be driven to a garage for repair unless it is booked in for pre-arranged work at that specific garage, in which case the trip is permitted under a specific legal exemption. Anyone unsure whether their situation qualifies should ask the garage directly or arrange recovery. The fine and points for driving on a dangerous fault apply however short or well-intentioned the trip is.

Sources: Driver and Vehicle Standards Agency (DVSA), “MOT testing statistics,” MOT test results by class of vehicle and MOT class 3 and 4 vehicles: initial failures by defect category, data tables published to gov.uk covering Quarter 1 2026 to 2027 (April to June 2026). DVSA, MOT test fees poster (VT9A). TyreSafe, tyre law and penalty guidance.