I have a 2001 Audi S4 Avant with 105,000 miles on it. Overnight I developed a loss of horsepower and or torque, so my independent Audi mechanic did the computer diagnostics even while driving the car but no trouble engine codes or anything has shown up. He changed out the MAF, the air cleaner, and put in some 44K injector cleaner with no significant, if any, improvement. He tested the oxygen sensors before and after the catalytic converter, checked vacuum leaks, turbo boost and all are within Audi parameters. He said it is running lean for "optimum" performance but not this significant..

Should I reset my ECU by unhooking the battery to see if the computer just needs reset (if I have the radio code)?

What next?

jcarriso
Tulsa, OK

 

very odd no codes at all?? forget the battery it wont do anything get it checked else where

 

Any tests I can run without going to the dreaded local Audi dealer to do a $85/hour analysis?

 

What are your thoughts on my problem being limp modes?

 

limp mode would show codes

 

edit: posted to the wrong topic