Airbag Warning Light: What It Means and Why You Should Not Ignore It
The airbag (SRS) light means the car has found a fault in the airbag system and some or all of the airbags may not deploy in a crash. The car drives normally, but you are travelling without part of your crash protection, and the light is an automatic MOT failure. Diagnosis is £50-95 and common fixes run £80-350.
What it means
The airbag system, properly called SRS (supplemental restraint system), checks itself every time you turn the ignition on. It monitors the airbags, the seatbelt pretensioners, the crash sensors and all the wiring between them. If anything fails that check, the light stays on and the system may be partly or fully disabled.
That is the honest problem with this light: you cannot tell from the driver's seat whether one seat sensor has failed or the whole system is offline. Only a code reader that can access the SRS module will tell you.
Can you keep driving?
Amber, but with a serious caveat. The car itself drives exactly as normal, nothing about the engine, brakes or steering is affected. What has changed is what happens in a crash: the airbags and pretensioners may not fire. There is also a small flip side, a genuinely faulty system could in theory behave unpredictably. Do not pay for recovery, but do not sit on this one for months either. Book a diagnostic within the week.
Most common causes
- Clock spring failure in the steering wheel, very common, often after a wheel or column repair
- Wiring and connectors under the front seats, disturbed by moving the seat or items stored beneath it
- Seat occupancy or seatbelt buckle sensor faults
- Water damage to crash sensors or connectors
- Airbag control module faults, sometimes after a flat battery or jump start
What it costs to fix
| Repair | Typical UK independent garage price |
|---|---|
| Diagnostic check (SRS scan) | £50-95 |
| Under-seat wiring/connector repair | £80-200 |
| Clock spring replacement | £150-350 |
| Seatbelt pretensioner/buckle unit | £120-300 |
| Airbag control module | £250-600 |
Airbag work is one area where cutting corners is a bad idea. Insist on genuine or reputable parts, an airbag that fires late or not at all is worse than useless.
Will it fail the MOT?
Yes. An illuminated airbag warning light indicating a malfunction is a major defect and the car fails the MOT. An airbag that is obviously missing or defective is also a fail. As with ABS, the lamp itself is checked, so removing the bulb or covering it is a fail in its own right and a genuinely dangerous bodge.
Common questions
The light came on after I moved the front seat, is that a coincidence?
Probably not. The wiring and connectors for the seat airbag, pretensioner and occupancy sensor run under the seat, and sliding it fully forward or back, or shoving bags underneath, can disturb them. It is one of the most common airbag light causes and often one of the cheapest to fix.
Will the airbags still work with the light on?
You have to assume not. Depending on the fault the system may be fully disabled or only partly affected, but there is no way to know from the driver's seat. Treat the car as having reduced crash protection until a garage reads the SRS fault codes.
Can any garage fix an airbag light or do I need a dealer?
Most decent independents have diagnostic kit that reads SRS modules and can handle common repairs like clock springs and under-seat wiring. You rarely need a main dealer, though for control module coding on some makes an independent may refer you to a specialist.