I have a 2001 S4 and have some problems with the engine....

Took it to three shops(one being the stealership) and no one can figure out whats wrong with my car.

Car history...
Had car chipped ran awesome then a few months after being chipped started to have a engine sputter around 3800rpm. CEL came on, had engine missfires, replaced spark plugs(gapped properly) didn't fix problem. Alternator went, had replaced. Car would fall flat on its face at around 3800rpm but got worse if given more gas. This was summer of 2009. Car sat all winter.

Took car in May to two shops and they couldn't find whats wrong with it, went to the dealership they said my DV's and N75 were bad and wouldn't diag. any more till they were replaced. I replaced them myself since they wanted to charge me $1300 for them to do it.

Today, I have replaced all three valve, CEL came back on after being cleared and VAG-com came up with these codes...


17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
P1455 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1: Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3: Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2: Misfire Detected
P0302 - 35-00 - -
17870 - Exhaust Gas Temp Regulation for Bank 2: Implausible Signal
P1462 - 35-10 - - - Intermittent
17865 - Exhaust Gas Temp Sensor 2 (G236): Open or Short to Plus
P1457 - 35-10 - - - Intermittent
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent
16534 - Oxygen (Lambda) Sensor B2 S1: Malfunction in Circuit
P0150 - 35-10 - - - Intermittent
17964 - Charge Pressure Control: Negative Deviation
P1556 - 35-00 - -
17868 - Exhaust Gas Temp Regulation for Bank 2: Limit Reached
P1460 - 35-10 - - - Intermittent
17869 - Exhaust Gas Temp Regulation for Bank 1: Implausible Signal
P1461 - 35-10 - - - Intermittent
16688 - Cylinder 4: Misfire Detected
P0304 - 35-00 - -
16690 - Cylinder 6: Misfire Detected
P0306 - 35-00 - -
16689 - Cylinder 5: Misfire Detected
P0305 - 35-00 - -


Parts replaced:
MAF
DV's(Forge Motorsport)
N75
Spark Plugs(NGK's)

One shop said it is a boost leak but they couldn't find it.

I am looking for any suggestions as to whats wrong or where I should start...

 

i bet it's the exhaust gas temp sensor causing all that..... my buddy's car was doing the same thing.... no boost too right?