duckS4

Please help. I have 2000 S4 with 93oct APR chip & 710n's, the rest stock.

While on full throttle I get hesitation and sometimes misfires. I got it smoke tested and had the following codes below.

The smoke test found a small leak in the breather hose/tube near the passenger-side bypass valve, as well a leak in the 5th cylinder fuel injector seal.

17865-Exhaust gas temp sensor 2 (G236) Open or short to positive. P1457
16684 Random Multiple cylinder misfire
(also misfire code on all cylinders)
17539 Oxygen sensor B2 S1; Internal resistance too high
17869 Exhaust Gas temp regulator for bank 1; Implausible Signal

Does anyone think that if I get the seals replaced for the fuel injector as well as replace the leaky breather hose, that it may solve the other problems?

Or are my EGT's for sure bad? If so, are BOTH bad?

Thank you very much for any help.

complacentsee

EGT 2 is failed. or wiring has, but probabaly the sensor.
EGT 1 has failed or is failing, either way your EGTs are both ****ed. Which will cause limp at WOT.

rktskicar

2nd. B2S1 O2 sensor shot as well.

complacentsee

Bank 1 parts are a bitch to swap, if your going to be doing it yourself I hope your double jointed.

RolledMySTi

Replace both egt's and clear the codes. The o2 sensor may be ok, just having troubles with the bad egt's.

complacentsee

Yeah, doing the O2 at the same time wont really save you any time unless your going to drop the down pipe or something.

About the leak. pretty much any leak on these cars should get fixxed since it will cause a lean condition and the car will just dump more fuel.