Vauxhall Vectra Drive Belt Problems

Could you please tell me if its my airflow sensor thats causing the problem. Bought second hand sensor, worked for a wee while. I bought new air filter and put it in, it doesn't seem to work for long with new filter but when i take it out i...

Everytime I turn the engine on and off there is a squealing sound which lasts for a few seconds. Any ideas on what the problem may be?

Happens first thing in the morning when it is cold or has rained night before. When I start the car up it makes a noise on the front right hand side. It sounds like a belt?? Depending on weather if I start it and leave it idle the noise wil...