After a crash
- Confirm bags, pretensioners, and damaged sensors are replaced
- Expect the ECU to still hold crash data until it is cleared
- Order a postal crash data reset
- Refit the module, confirm the light is out, then retest
Specialists in crash data & module repair
Airbag Light
and the MOT.
An airbag warning light on is an MOT fail in the UK. Here is what that means after a crash, and how a postal module reset gets you ready to retest.
Why an airbag light fails the MOT
UK MOT rules treat a permanent airbag warning light as evidence the supplementary restraint system is not healthy. Testers are not there to argue about whether the bags would still fire. If the SRS lamp is on, the car fails until the fault is fixed and the light behaves correctly. See the official GOV.UK MOT inspection manual for private passenger and light commercial vehicles.
That catches post-crash cars as often as everyday sensor faults. Bags and belts may already be replaced, yet the control module still holds crash data, so the light never goes out. An MOT retest will keep failing until that module is properly reset.
What to do if the airbag light is on before your MOT
Do not book the test hoping the lamp will be ignored. Get a scan, match the fault to a real repair, then clear or reset as needed. Guessing wastes a fail fee and another day off the road.
No crash, light still on
- Scan for seat mat, clock spring, wiring, or sensor codes
- Fix the open circuit on the car first where the scan points
- Only post the ECU if the fault sits in the module itself
- WhatsApp codes and a label photo if you want a second opinion
Postal reset before an MOT retest
Once vehicle repairs are done, remove the airbag ECU and send it to Universal Square, Devonshire St N, Manchester M12 6JH. We clear crash data, test the unit, and return it for refit. For most modules, if we receive it in the morning, we complete the crash data reset and send it back the same day. Fixed prices: most modules £35, complex £46, motorhome B0100-49 £65.
Plan postage both ways around your retest slot. A weekday morning delivery into Manchester gives the best chance of same-day dispatch. See same-day airbag reset for timing detail.
MOT timeline that usually works
- Scan and finish bags, belts, and wiring repairs
- Order the matching module reset and post the ECU
- Refit when it returns and confirm the SRS light is out
- Book the MOT retest once the dash stays clear
Crash repairs, the light, and the test
People often search “airbag light MOT” right after an accident repair. The sequence is the same every time: make the car’s restraint hardware complete, clear the module’s crash memory, then prove the light stays off. Skipping the crash data step is why so many cars fail again a week later.
More detail: airbag light on after accident, airbag warning light on, and how to remove the airbag module for packing.
Three steps
How it works
Order online, post the module, plug it back in. Read the full process.
Pick your module
Search the part number stamped on the ECU, or send a photo of the label. Not sure? WhatsApp us and we will help you find the right module.
Checkout and post
Pay by card, bank transfer, or call us. Pack the module securely and send it with your order details inside.
We reset and return
We clear the crash data, test the unit, and send it back ready to fit. Most morning arrivals go out the same day.
What to put in the parcel
- The airbag module / ECU only
- Your order number written inside
- A clear photo of the label kept on your phone
- Strong packaging (insured outbound postage if you want it)
Our guides
Short reads to help you find the right module and know what happens next.
How to find your airbag module part number
Where to look on the ECU label, what the codes mean, and how to order the right reset first time.
Read Guide
What happens during a crash data reset
A plain-English look at what we clear, how we test the unit, and when it is ready to fit again.
Read GuideAirbag light on after a crash
Why the light stays on, when a postal reset is the right next step, and what to check before you send it.
Read GuideWhat our customers say
Real feedback from drivers and garages who send modules to us every week.
James T.Manchester · Google
Posted my BMW airbag module on Monday and had it back Wednesday. Clear emails the whole way and the airbag light went straight out.
Sarah K.Leeds · Trustpilot
WhatsApped a photo of the label and they found the right module for me. Fair price, insured postage, and the crash data reset sorted it.
Dave R.Birmingham · Google
We send customer airbag modules from the garage every week. Same-day turnaround when it arrives in the morning. Proper reliable.
Amelia P.Bristol · Trustpilot
Airbag light stayed on after a minor shunt. Ordered the postal reset online, packed it up, and plugged it back in when it came home. Job done.
Chris W.Glasgow · Google
Needed a Ford airbag ECU cleared and was worried about buying the wrong reset. They checked the part number and talked me through it. No fuss.
Natalie H.Cardiff · Trustpilot
Motorhome airbag light on a Fiat Ducato. They knew the module straight away. Posted it Friday, back early the next week. Really helpful lot.
Clear fixed pricing
Fixed public prices for the reset. Return shipping is chosen separately at checkout.
Return shipping
When the reset is done, we send your module back the way you choose at checkout. Royal Mail Tracked 24, Tracked 48, or free workshop collect if you are picking it up in Manchester. That return leg is separate from the reset price.
Airbag light MOT FAQs
Does an airbag warning light fail an MOT in the UK?
Yes. A permanently illuminated airbag / SRS warning light is a reason for MOT failure. The tester needs the restraint system to show as healthy, not locked in a fault or crash state.
Will clearing the light with a basic OBD tool pass the MOT?
Only if the underlying fault is gone. If crash data is still stored in the airbag module, the light usually returns. A proper crash data reset on the ECU is the lasting fix after bags and belts are repaired.
I had a crash, replaced the bags, and the light is still on. Will I fail?
Very likely yes until the module is cleared. Post the ECU for a crash data reset once the vehicle repairs are done. Most resets are £35, complex £46, motorhome B0100-49 £65.
How long does a postal reset take before my MOT retest?
For most modules, if we receive it in the morning, we complete the crash data reset and send it back the same day. Build in postage time both ways. Weekday morning arrivals give you the best chance of a quick turnaround from Universal Square, Devonshire St N, Manchester M12 6JH.
Can the MOT tester reset the airbag module for me?
MOT stations test the vehicle. They do not normally perform specialist SRS crash data clears on the bench. That work is done by airbag module specialists like us, then you refit and retest.
What if the light is on but there was no crash?
Seat occupancy mats, clock springs, wiring, and sensors can all trigger the light without a deployment. Scan first. If the fault points at the module itself, WhatsApp us the codes and label photo before you post.
More guides: all guides. Compare reset vs replace if a dealer quoted a new ECU.