S3 exhaust gas temp sensor problem


Registered User
Hi I have a 2001 audi s3 amk engine and I have had a problem with it feeling sluggish I have sorted some boost leaks and I forgot to plug in the exhaust gas temp sensor went for a drive and it felt great plugged vag com on to the car found egt to bee open circuit so plugged it back in went for a drive and it felt sluggish again any surgestions on what the problem could be


Registered User
Doesn't the egt stores an error when its plugged and you scan the car with vag com


Badger 5 Edition...Its all about the flow...
Staff member
With the EGT probe disconnected the ecu runs in protection tables (ecu sees a temp of 1100 degrees) and will over fuel (0.75 lambda) all the time... you will get rubbish MPG and bore wash which promotes engine wear..

I think the 'sluggishness' could be something else tbh... clear all fault codes and see what comes back... allow the ECU to adapt properly (will take a few miles of driving) and this should bring things back in check...

Failing that logging will be needed to see if there is any other issues