MOT performance
MOT failure “SRS malfunction indicator lamp: warning lamp indicates a fault”: how common it is and which cars get it
“SRS malfunction indicator lamp: warning lamp indicates a fault” (major defect, seat belts and airbags) was recorded as a failure on 0.48% of UK MOT tests in 2023–2024: 312,541 tests, the number 34 most common failure item. It is 3.4 times as common at 10 years old (0.46%) as at 3 (0.14%). It is most common at 19 years old (1.49% of tests).
312,541 tests with this failure, 2023–2024
Check a specific car's MOT history and running costsAt a glance
| Figure | Value | Basis |
|---|---|---|
| Share of MOT tests | 0.48% | 312,541 tests, 2023–2024 |
| Rank among failure items | #34 | by number of tests |
| Most common at | 19 years old | 1.49% of tests at that age |
| Models compared | 372 | models with enough tests |
How it changes with age
By fuel
Diesel: 0.57% of tests; Petrol: 0.44% of tests; Electric: 0.12% of tests; Hybrid: 0.07% of tests. Fuel groups differ in age and mileage, so these raw shares are not like-for-like; the model tables below are.
Models that fail on it most often
Relative to cars of the same age and fuel (1.00 = national rate for this item). Only models with enough tests for the difference to be clear are ranked.
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| MG MG3 | 39,968 | 1.92% | +1103% |
| SEAT Mii | 36,559 | 1.54% | +557% |
| Nissan NV200 | 51,677 | 2.45% | +461% |
| Fiat Swift | 15,103 | 1.07% | +420% |
| Mercedes-Benz CLA | 117,936 | 0.95% | +357% |
| Mercedes-Benz A-Class | 685,711 | 1.48% | +355% |
| Fiat Auto Trail | 20,441 | 1.26% | +315% |
| Mercedes-Benz Viano | 11,169 | 3.28% | +257% |
| Nissan Qashqai | 1,126,671 | 1.30% | +255% |
| Chevrolet Captiva | 13,179 | 2.68% | +250% |
Models that fail on it least often
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Lexus NX | 53,608 | 0.00% | -97% |
| Land Rover Defender | 219,897 | 0.03% | -95% |
| Lotus Elise | 10,204 | 0.05% | -95% |
| Toyota MR2 | 21,325 | 0.06% | -94% |
| Kia Stonic | 47,147 | 0.01% | -92% |
| Toyota Hi-Ace | 30,426 | 0.10% | -92% |
| London Taxis International TX4 | 26,655 | 0.04% | -92% |
| Mitsubishi Eclipse | 23,361 | 0.01% | -91% |
| Mazda CX-5 | 128,119 | 0.03% | -90% |
| Peugeot Horizon | 17,208 | 0.03% | -88% |
Makes that stand out on this failure
About this defect
The wording is DVSA's, from the MOT inspection manual. A high ratio for a model reflects its MOT record, which depends on maintenance and use as well as design. For one car, its own MOT history shows whether this has come up before.
Other common seat belts and airbags failures
- Prescribed areas: prescribed area strength or continuity significantly reduced · 0.20% of tests
- Condition: buckle not functioning as intended · 0.11% of tests
- Condition: not functioning as intended · 0.08% of tests
- Condition: retracting mechanism defective · 0.04% of tests
Check the car you are looking at
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UK number plate or 17-character VIN
About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.