Issue with Audi A4 B7 (57 Plate)

[reddit101]

Hi there, I have an Audi A4 B7 that currently has just over 100K miles. The issue is that once the engine is warm (after 10 minutes or so) if I turn off the ignition, it wont start again until the engine is cool. I've had a mechanic check the ecu relays and starter motor, but they still can't seem to find the fault. Having read on a forum that it could possibly be the coolant sensor, I had a mechanic check this but he said it was fine. Not sure what else could be at fault, so could you please help me.

Thanks.

 

[atktony]

It could be the cam shaft sensor
Try get some body with VCDS to scan the car if it's the cam shaft sensor there should be a fault showing

 

[cactikid]

cam shaft or crank shaft sensors are known for issues when hot to cut out and not start until cool.