MotR
🫧 Drive with Caution

Airbag Warning Light

An illuminated airbag or SRS light means your supplemental restraint system has a fault. Your airbags may not deploy in a collision — and in rare cases, they could deploy unexpectedly. Here's what you need to know.

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UK car instrument cluster showing SRS airbag warning light illuminated with steering wheel visible — airbag warning guide
What it means

What This Warning Light Means

The airbag warning light (often labelled SRS — Supplemental Restraint System) indicates that the system responsible for deploying airbags and controlling seatbelt pre-tensioners has detected a fault. A faulty SRS system means that in a collision, your airbags may fail to deploy, or may deploy at the wrong time. This is a genuine safety risk for you and your passengers, even if the car drives perfectly normally.

Severity & action

How Serious Is It — and What To Do

🟡 Safety Risk — Repair Promptly

The car drives normally but your passive safety system is compromised. This means in a serious collision, the protection you rely on may not function. This is not a fault to defer. Every mile you drive with an unresolved airbag fault is a mile where the system designed to save your life may fail.

Can drive with caution

You can drive, but understand the risk. If the airbag light is accompanied by the seatbelt warning light, there may also be an issue with your seatbelt pre-tensioners. Have the fault diagnosed as soon as possible. Do not attempt to diagnose or repair SRS faults yourself — incorrect handling of airbag components can cause inadvertent deployment.

Stop immediately if…

If the airbag light comes on immediately after a minor impact — even a car park bump with no visible damage — stop and have the car assessed before driving further. Crash sensors may have been triggered, and the car may have sustained structural damage that is not externally visible. Do not reset the light yourself after an impact.
Common causes

Common Causes

Faulty SRS crash sensor — impact sensors under the vehicle have been damaged or have degraded
Faulty clock spring (spiral cable) — the coiled connector behind the steering wheel that maintains circuit continuity through steering rotation has failed
Seat belt pre-tensioner fault — a seatbelt tensioner or buckle sensor has developed a fault
Corrosion in SRS wiring connectors — moisture in the yellow SRS wiring connectors causes resistance faults
Previous minor impact — even a minor bump can activate a crash sensor without deploying airbags
Airbag module fault — the SRS control unit itself has failed
Seat sensor fault — passenger seat weight/occupancy sensors have failed, affecting passenger airbag control
Low battery voltage — SRS systems are sensitive to voltage drops during battery discharge or replacement
MOT relevance

Can It Fail an MOT?

🔍 MOT Implications

An illuminated airbag/SRS warning light results in an automatic MOT failure. Testers also check that the airbag system has not been tampered with, that airbag cover panels are correctly fitted, and that no airbag components are obviously damaged or missing. A vehicle with airbags that have been deployed and not professionally replaced will also fail.
Repair costs

Typical UK Repair Costs

IssueLikelihoodEst. UK costDIY?
Clock Spring / Spiral Cable FailureVery Common — especially on vehicles with steering wheel controls£150–£350 parts and labourPro
Corroded SRS ConnectorCommon — especially in vehicles over 8 years old£60–£200 depending on connector location and accessPro
Passenger Seat Occupancy SensorCommon£120–£400 depending on vehiclePro
SRS Control ModuleLess CommonRepair specialist: £200–£400. New module: £400–£1,200 plus codingPro
Triggered Crash Sensor After Minor ImpactOccasionalDiagnostic and reset: £50–£100. Sensor replacement if damaged: £100–£250Pro

Costs are estimates based on UK independent garages. Main dealer prices may be higher.

In detail

Common Fixes in Detail

Clock Spring / Spiral Cable FailureVery Common — especially on vehicles with steering wheel controls

The clock spring is a wound ribbon cable inside the steering column that connects the airbag, horn, and steering wheel controls through the rotating steering column. It wears out over time. Failure causes an airbag fault code specific to the driver airbag circuit. Replacement requires steering column disassembly.

£150–£350 parts and labour

Professional repair required

Corroded SRS ConnectorCommon — especially in vehicles over 8 years old

The SRS wiring uses yellow-sheathed connectors to distinguish it from normal wiring. These connectors can suffer from moisture ingress and corrosion, particularly under seats where water accumulates. Cleaning or replacing the affected connector resolves the fault.

£60–£200 depending on connector location and access

Professional repair required

Passenger Seat Occupancy SensorCommon

The seat occupancy sensor (sometimes called a mat or bladder sensor) detects whether a passenger is seated and their approximate weight to control airbag deployment. These sensors fail and cause SRS fault codes. Replacement usually involves removing the seat.

£120–£400 depending on vehicle

Professional repair required

SRS Control ModuleLess Common

The airbag control module can fail due to water damage, electrical fault, or physical damage. In some cases specialist remanufacturers can repair and re-flash the existing module for less than replacement cost. Note: after any significant collision, the airbag module stores crash data and must be replaced or reset.

Repair specialist: £200–£400. New module: £400–£1,200 plus coding

Professional repair required

Triggered Crash Sensor After Minor ImpactOccasional

Low-speed impacts — even a parking bump — can trigger satellite crash sensors without deploying the airbags. The fault code remains stored and lights the warning. A technician can confirm no physical damage to the sensor before resetting the fault.

Diagnostic and reset: £50–£100. Sensor replacement if damaged: £100–£250

Professional repair required

Ownership & maintenance

Ownership & Maintenance

Long-Term Impact

Modern vehicles typically have between 6 and 12 airbags — front, side, curtain, knee bolster, and even rear airbags on some models. An SRS fault code can affect any one of these circuits. A vehicle with a faulty SRS that is involved in a serious collision may have significantly worse occupant outcomes. For this reason, SRS faults should never be treated as cosmetic or low-priority.

Good Habits

Never leave wet clothing, sports kit, or shopping on front passenger seats for extended periods — this is a major cause of seat occupancy sensor damage. Be careful when installing child seats — the heavy repetitive clamping action can damage the seat pad sensor over time. After any impact, however minor, have the SRS system scanned before driving further.

Recurring Issues

If the airbag light keeps returning after being reset, an intermittent fault is present. Common culprits are a partially failing clock spring (which faults on left or right steering lock) or a seat connector that corrodes seasonally. An intermittent fault that a scanner only captures occasionally requires extended logging to diagnose properly.

Vehicle Health

The SRS system performs a self-test every time the ignition is switched on — that's the brief airbag light illumination you see when starting the car. If the light stays on after start-up rather than extinguishing, the self-test has found a fault. This system has been saving lives since the 1980s — when it reports a problem, take it seriously.
Questions & answers

Frequently Asked Questions

Can I drive with the airbag light on?
You can drive, but your airbags are not guaranteed to deploy in a collision. For a short journey to a garage this is acceptable, but driving indefinitely with a known SRS fault is inadvisable and means your vehicle is in an unroadworthy condition. Repair it promptly.
Could the airbag accidentally deploy while I'm driving?
This is rare, but certain SRS faults — particularly those involving the clock spring or a partially triggered crash sensor — theoretically increase the risk of inadvertent deployment. This is another reason to have SRS faults diagnosed promptly rather than ignored.
The airbag light came on after I had my car serviced — what happened?
Battery disconnection during a service can occasionally trigger SRS warning lights if the system wasn't properly isolated. Seat disconnection, steering column work, or any wiring disturbed during service can also trigger a fault. Ask the garage to perform a diagnostic scan — if a code was set during their work, they should clear it free of charge.
Can I reset the airbag light myself?
A generic OBD2 scanner will not clear SRS fault codes — these are stored in a separate SRS module that requires a more capable scanner. Specialist airbag reset tools are available online, but unless you understand what fault you are clearing and why, resetting without repair is masking a safety fault.
My airbag deployed in an accident — can I just have the light reset?
No. After airbag deployment, the airbag itself is destroyed and must be replaced. The seatbelt pre-tensioners are also typically single-use and must be replaced. The SRS module stores crash data and often requires replacement or specialist re-programming. This is a significant repair costing £800–£3,000+ depending on which airbags deployed.
Does the airbag warning light fail an MOT?
Yes, automatically. Any illuminated warning light fails the MOT test. The tester will also check that the airbag covers are correctly fitted and that no components are visibly damaged or missing. A car where airbags have been deployed and not replaced will also fail.
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Warning-light guidance is general UK advice and does not confirm manufacturer-specific behaviour — always check your vehicle handbook. Any illuminated warning light at the time of the MOT test is an automatic failure under the 2018 DVSA rules. MotR is not affiliated with DVLA, DVSA or any vehicle manufacturer. Last reviewed June 2026.

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