If the airbag warning light stays on, it should not be ignored. It may indicate a fault in the Supplemental Restraint System (SRS), and in many cases it can affect MOT results in the UK.
Yes, an illuminated airbag warning light can lead to an MOT failure because it may indicate a fault in an important safety system.
If the light appears during startup and goes out normally, that is different from a warning light that remains on.
The airbag and seatbelt pretensioner system is designed to help protect occupants during a collision.
If a fault is present, the system may not operate correctly when needed.
Wiring under front seats is a common cause.
Low voltage can trigger system faults on some cars.
The steering wheel wiring ribbon can fail.
Impact sensors or modules may store faults.
Part of the SRS system and may trigger the warning.
Poor-quality repairs can leave unresolved faults.
Loose connector repair: low cost
Diagnostic scan: £30–£80
Clock spring replacement: £150–£400
Module or sensor faults: varies
Only fixing the real fault is reliable. Lights often return.
The car may drive normally, but safety systems may be compromised.
Yes, some vehicles trigger SRS faults after weak battery events.
No. Intermittent faults can become permanent later.
