I'm screwed.. unless somebody can help? Dealer effed up my2000 A4 TQ big time. Chasing electrical problems big time. Replaced 3 yes three Oxygen sensors (upstream and downstream) but still throws the 17536 codes and loses performance. Thinking now is that my ECM is hosed. Worked yesterday after another new sensor (upstream) great, then died (check engine light-no turbo) after 15 miles. I'm crazy and broke from buying these sensors. Possible ECM issue?? Help!!

 

well first if the replaced parts and said the problems fixed
but its stilll there take it back to them

 

Why would you have to pay for the O2 sensors if it didn't fix the problem??

 

that's because code 17536 P1128 is nothing to do with o2 sensor though it will effect the readings, problem is long term fuel trim, entire speed/load range, bank 1 - system too lean, possible faults are - fuel pressure/pump, injector(s), intake/exhaust leak, AIR system, hose leak

 

If thats the case then you have to figure out if the Computer is getting bad Info
to make it run lean or the computer gets tthe correct Info but sending the wrong signal
to the injecter duty cycle
By the way is this in Closed Looop ?