Hi,


I have an 01 Audi TT quattro and I keep getting a CEL, of course the possibilities are the MAF, 02 sensor etc. I was wondering if there is a way to trick the 02 sensor without having to by a new one? Its saying the system is too lean. Im assuming in the secondary one next to the cat? I have the 42 dd 3" dp and the apr chip 93 octane(just throwing that out there) Hope someone can help, it not ill just have to buy a new sensor

 

which bank, 1 or 2? Bank 1 is a precat o2 and is either a bad o2, maf, vac leak, or boost leak. Bank 2 would be post o2 but would throw a cat below threshold code. It would be too rich if the cat is gone or flows to much

 

Its bank one then....like i said ive replaced the MAF twice, boost leak i dont know where that would be, and as far as the vac leak everything checked out ok. Is the precat 02 underneath the car on the exhaust?

 

just after the turbo.