Black Smoke and Lumpy then Gone !

[driftin jo]

Prior to upgraded my 3b the car was running fine, after fitting the RS2 turbo and running the car for the first time it leaked a considerable amount of oil from the hot side into the exhaust. Turbo's sorted now but wondering if all that oil has broken the Lambda sensor ??

The oil will have killed your lambda probe

[ian4455]

thanks, Can it be cleaned ?

[UrS4boy]

Code 0537 Details

Using a fault code reader i get a 0537 fault code after it starts running lumpy.

2341 (Blink Fault Code), 00537 VAG1551/2 Fault Code Number
Oxygen Sensor Control Limit exceeded:
fuel pressure too low or too high, intake or exhaust leak, defective ignition system component, intake air leak after air mass sensor, O2 sensor is faulty

So based on your new story (which you should have told us earlier) about your initial turbo install leaking oil into the exhaust downpipe, you might have an O2 (Lambda) sensor with a coating of burnt oil on it. At the very least, you are going to have to remove the O2 sensor and check and possibly clean it (carb cleaner??) and reinstall. Otherwise, you will have to replace it. Audi PN is 034906265F. Here is some O2 sensor info:

http://forums.quattroworld.com/s4s6/msgs/21012.phtml

[ian4455]

Removed the O2 sensor and found one of the white wires has come away from the sensor.

Its a three wire sensor so which part number is the correct one as it's not listed for a 3b??

[UrS4boy]

Removed the O2 sensor and found one of the white wires has come away from the sensor. Its a three wire sensor so which part number is the correct one as it's not listed for a 3b??

Well at least you found the problem. The Audi PN is 034906265F, as I posted above. Same as AAN, ABY and ADU and 7A, NM, MC, etc. etc. extremely common Audi part.

[ian4455]

Thanks for your help, I'll set about trying to get one monday, fingers crossed this sorts it out.

[UrS4boy]

Thanks for your help, I'll set about trying to get one monday, fingers crossed this sorts it out.

To remove the O2 sensor from the down pipe, did you use a socket with a slot in it (for the wires to sit in, out of the way), like this one or a crowsfoot?:

[ian4455]

I unclipped the wires first and unplugged them, open ended spanner to slacken off the 02 sensor and carefully rotated the wires as i unscrewed it. Removed the airbox first, then its easy to get at with my downpipe.

[newsh]

When you put it back together make sure the sensor is not rubbing on the heat sheild on the bottom of the air box.