Before the test
How to prepare for an MOT
Many MOT fails are avoidable with basic checks. Use this pre-test checklist before you book — it does not replace a professional inspection.
Last reviewed 2026-10-02
Why preparation matters
The MOT is a standardised test, not a surprise inspection. Testers must apply the same rules at every authorised centre in Great Britain.
Drivers often fail for items they could fix at home in minutes — a blown bulb, an empty washer bottle, or illegal tyre tread. Preparation saves retest time and garage labour for trivial jobs.
This checklist is educational. For the full test scope, see DVSA’s published inspection standards linked from GOV.UK — Getting an MOT.
Lights, plates and visibility
Check headlights (including main beam), indicators, brake lights, fog lights where fitted, and number plate lights. Ask someone to help confirm brake lights while you press the pedal.
Ensure front and rear registration plates are clean, securely mounted, and correctly formatted. Top up windscreen washer fluid and replace worn wiper blades that smear.
Remove large obstructions from the windscreen inside the swept area — dangling air fresheners will not fail alone, but vision-blocking items can.
Tyres, brakes and suspension (visual checks)
Tyres need at least 1.6 mm tread depth across the central three-quarters of the breadth around the entire circumference — many garages recommend replacing sooner. Look for cuts, bulges, or uneven wear.
Walk the car and listen for obvious suspension clunks on bumps. You cannot fully inspect brakes without equipment, but listen for grinding and check the handbrake holds on a slope.
Before you leave for the garage
Clear boot clutter so the tester can access the spare wheel or repair kit if required. Remove heavy roof boxes unless needed — excess weight can affect emissions on some tests.
Bring the locking wheel nut key if alloys are fitted. Book with a reputable authorised MOT test centre and confirm the fee in advance — see how much an MOT costs.
Run an MOT history check on MOTCheckers to see last year’s advisories — fixing those first improves pass chances.
If you find problems
Minor bulb or wiper replacements are often inexpensive at a fast-fit centre. Structural corrosion or emissions issues need a proper garage diagnosis.
If the MOT is close to expiry, book early within the early testing window so you have time for repairs and a retest if needed.
Frequently asked questions
Should I service the car before the MOT?+
A service is optional for the MOT itself but helps with emissions and general reliability. Fresh oil can sometimes help borderline emissions — ask your garage if the car has a history of fails on that test.
Will a dashboard warning light fail the MOT?+
Some warning lights (for example airbag or ESC where fitted) can fail the test if they indicate a fault. Read the MOT inspection manual categories on GOV.UK for your vehicle class.