aar104

Hi I have a 60 plate A4 Saloon and recently when I put my car into reverse my sensors don’t click on as usual and I’m not sure where in the car to look to check for faults any ideas? I’ve heard of a few people having the issue of where the engine stop start is meant to come on but it doesn’t on the dash it says it’s activated but engine still running loud any ideas on how to solve? Any ideas on what to do to get the best amount of BHP out of my 2.0 engine which parts are best to start with?