Which Dashboard Lights Fail an MOT? UK Guide
Certain dashboard warning lights will result in an MOT failure in the UK.
If you notice a warning light illuminated, it’s worth resolving the issue before booking your MOT test to avoid an automatic fail.
Below, we’ve outlined which lights are instant MOT fails and which may also lead to failure depending on the fault.
Instant MOT Fail Dashboard Lights
These warning lights will immediately result in an MOT fail.
Engine Management Light (EML)
If the EML is glowing red, it indicates a serious fault and will result in an automatic MOT fail.
If it’s amber and not flashing, most garages will fail the car unless they are certain the fault code is not serious.
The EML typically relates to engine emissions or performance issues.
Anti-lock Braking System (ABS) Warning Light
ABS prevents the wheels from locking under heavy braking, helping maintain grip and steering control.
If the ABS warning light is on, the system may not function properly — which is considered a serious safety issue and will result in an MOT fail.
Airbag Warning Light (SRS Light)
Also known as the Supplementary Restraint System (SRS) light, this indicates a fault with your airbags.
Because airbags are critical safety components, any fault will lead to an MOT failure.
Warning Lights That May Cause an MOT Fail
These lights indicate serious faults that could lead to a fail, depending on the severity and impact on safety or emissions.
Coolant Temperature Warning Light
This light indicates engine overheating.
If the overheating is likely to affect engine operation or emissions output, the vehicle will fail its MOT.
Brake System Warning Light
If the issue behind the warning light affects braking performance, the vehicle will fail.
This light may relate to:
Brake fluid levels
Hydraulic systems
Brake pads
Electronic Parking Brake Light
If the tester cannot reliably apply the parking brake, the vehicle will fail.
If the parking brake works correctly but the warning light indicates a fault, this may be recorded as an advisory instead.
Battery or Charging System Warning Light
If the battery or charging system cannot reliably power essential systems such as lighting, steering or safety features, the vehicle will fail its MOT.
Quick Answers
Does an engine warning light fail an MOT?
Yes. A red engine management light will automatically fail. An amber light will usually result in a fail unless the issue is confirmed as minor.
Will an ABS light fail an MOT?
Yes. An illuminated ABS warning light is an automatic fail.
Does an airbag light cause an MOT failure?
Yes. Any airbag (SRS) fault will result in an MOT fail.
Will a battery warning light fail an MOT?
It can. If the issue affects safety systems or essential functions, it may result in failure.