Dashboard warning lights are one of the most common causes of MOT failures on modern vehicles.
Modern cars contain many electronic safety systems. If certain warning lights remain illuminated during the MOT test, your vehicle may automatically fail.
The engine management light is one of the biggest MOT failure triggers.
This warning light may indicate:
Even if the car appears to drive normally, the warning light can still result in MOT failure.
The ABS (Anti-lock Braking System) warning light is considered a serious safety issue.
If this light stays on during the MOT, the vehicle will usually fail.
Common causes include:
Airbag system faults are also MOT failures.
Possible causes include:
This warning should never be ignored because it may mean airbags will not operate correctly in an accident.
Brake warning lights are treated very seriously during MOT testing.
Possible reasons include:
Temporarily clearing warning lights without fixing the underlying problem is risky.
Many faults quickly return once the vehicle is driven again.
Modern MOT testing procedures also make it harder to hide electronic faults.
CarCare Checker UK helps drivers understand MOT advisories, repair priorities and common warning signs in plain English.
Try CarCare Checker UKYes. Weak batteries can sometimes trigger multiple dashboard warnings, especially on newer vehicles.
However, repeated warning lights usually mean proper diagnostics are needed.