MOT Consumable Checklist
| Item | MOT Tested? | Common Failures | Fix Cost |
|---|---|---|---|
| Wiper Blades | Yes | Streaking, torn rubber, not clearing | £15–25 |
| All External Bulbs | Yes | Blown bulbs, wrong colour | £3–25 per bulb |
| Headlight Aim | Yes | Misaligned after bulb change | £20–30 at garage |
| Battery (indirect) | Partial | Loose terminals, corroded connections | £5 (terminal cleaning) |
| Exhaust Emissions | Yes | Worn spark plugs, wrong oil, DPF issues | Varies |
Pre-MOT Walkaround
A week before your MOT, do this 10-minute check:
- Turn on every light and walk around the car — headlights, sidelights, indicators, brake lights, reverse, fog, number plate.
- Test wipers on both speeds plus the washer.
- Check screenwash is topped up.
- Look at wiper blade rubber for tears or cracks.
- If your car is diesel, take it for a 20-minute motorway run to regenerate the DPF before the emissions test.
Frequently Asked Questions
What’s the most common MOT failure?
Lighting and signalling defects are the single most common MOT failure category. A £3 bulb can save you a retest.
Can I fail the MOT for wrong engine oil?
Not directly, but the wrong oil can cause high emissions (especially with DPF-equipped diesels), which will fail the emissions test.
Should I get a pre-MOT check?
If you’re not confident checking lights and wipers yourself, many garages offer a free or cheap pre-MOT visual inspection.
