Quick answer
If your washer system does not spray fluid onto the windscreen, sprays poorly, leaks badly or cannot help clear the screen, it may fail an MOT.
A simple issue such as an empty washer bottle is often easy to fix before the test.
Common reasons windscreen washers fail MOT
- 1Washer bottle empty
- 2Blocked washer jets
- 3Weak or failed washer pump
- 4Split or leaking washer hose
- 5Switch or electrical fault
- 6Poor spray pattern onto glass
What to check before your MOT
1. Fill washer fluid
Top up the bottle with proper screenwash.
2. Test spray
Check fluid reaches the windscreen properly.
3. Listen for pump
If no sound is heard, the pump or fuse may be faulty.
4. Check jets
Blocked jets can often be cleaned carefully.
5. Check leaks
Look for fluid leaking under bonnet or near wheels.
6. Check wipers too
Washers and wipers often go together in MOT checks.
Typical UK repair costs
Screenwash top-up
Low cost.
Jet cleaning
Often low cost or DIY.
Pump replacement
Often £50 to £180 depending on vehicle.
Costs vary depending on vehicle type and access.
Frequently asked questions
Will empty washer fluid fail MOT?
It can if the washers cannot operate properly.
Can blocked jets fail MOT?
Yes, if they stop fluid reaching the windscreen effectively.
Do rear washers matter?
Rear washer checks can depend on vehicle design and fitted equipment.
Can I fix it myself?
Many simple issues such as topping up fluid or cleaning jets are easy to fix.