Hello!

I'd like to ask your advice on my father's 2001 S4 with 84,000 miles.

It appears that he has an occasional power loss problem with the car. It
occurs usually at a low speed when he isn't running any accessories. If he
revs the engine with the clutch depressed, the engine seems to respond and
sound normally. When this happens the ECP light comes on and stays on until
he shuts off the engine and restarts. According to my Dad, the "heat" and
oxygen sensors have been replaced. I think he must be referring to the
thermostat but maybe not. The problem happens quite randomly.

Any thoughts appreciated (or links to threads).

Much appreciated.
-O

 

VAG-COM Check the codes and find out what they are. Can get them in the FAQ's page.
Also could be a problem with the oem coolant temp sensor. They were faulty and shitty. Go onto ECS and and buy one after that anyway, Like 19 bucks.