Belt squeal on start-up

Likely causes

1. Worn auxiliary belt80%

   A squeal on cold start or when turning the wheel very often comes from the auxiliary belt or its tensioner.

   Garage price: Auxiliary belt and tensioner £105 – £255
2. Leaking water pump10%
   Garage price: Water pump £145 – £455Garage price: Timing belt kit with water pump £315 – £780
3. Alternator not charging10%

   With the engine running, battery voltage should read 13.8 to 14.7 V. Below that, the alternator is not charging.

   Garage price: Alternator £255 – £640

What you can check yourself

1. If the belt is cracked or glazed on its inner face, replace it with its tensioner.

Fault codes often linked