Understanding the most common MOT failures can help your workshop prepare customers and reduce test times. Here are the top 10 failures we see across UK garages and practical prevention tips.
1. Lighting and Signalling (30% of failures)
Broken bulbs, faulty indicators, and number plate lights are the leading cause of MOT failures. Prevention tip: Include a quick lighting check during every service.
2. Suspension Issues
Worn shock absorbers and damaged springs affect safety and handling. Prevention tip: Test suspension during routine inspections and advise customers early.
3. Brakes (10% of failures)
Worn pads, corroded discs, and brake fluid issues cause failures. Prevention tip: Measure brake pad thickness and check fluid levels at every service.
4. Tyres (7.5% of failures)
Illegal tread depth, uneven wear, and damaged sidewalls are common. Prevention tip: Use automated reminders to prompt tyre checks before MOT due dates.
5. Steering and Alignment
Loose steering components and poor alignment affect vehicle control. Prevention tip: Include alignment checks in your pre-MOT inspection package.
6. Exhaust System
Corroded exhausts, loose mountings, and excessive emissions fail tests. Prevention tip: Conduct visual exhaust inspections during services and advise on rust treatment.
7. Windscreen and Wipers
Chips, cracks, and worn wiper blades are easy failures to prevent. Prevention tip: Stock replacement wiper blades and offer chip repairs.
8. Seat Belts
Frayed belts, faulty mechanisms, and warning light issues cause failures. Prevention tip: Test all seat belts during pre-MOT checks.
9. Registration Plates
Damaged, incorrect spacing, or illegible plates fail tests. Prevention tip: Offer plate replacements as an add-on service.
10. Driver’s View of the Road
Cracked mirrors and obstructed windscreens are common failures. Prevention tip: Remind customers to clear windscreen clutter before tests.
Using Technology to Reduce Failures
Modern garage management software like SeSar integrates with the DVLA to track MOT due dates and send automated reminders. By alerting customers 4-6 weeks before their MOT is due, you can schedule pre-MOT inspections and fix issues before test day.
The result? Higher first-time pass rates, happier customers, and more service revenue for your workshop.
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