2.0 FSI NOX Sensor

[rob07gti]

G'day all, a few months ago the engine/exhaust light came on on my 04 FSI Golf. I took it to the local mechanic who plugged in the diagnostic computer he had and it read NOX Sensor without any further information. He rang an ECU specialist and quoted $1200 to fix it (ouch!).

I've e-mailed lambdapower.co.uk, they have the part but after trying to remove what I thought was the sensor (I couldn't) and find the sensor controller (I can't) decided that the pros needed to do this job.

I took it in to the mechanic today to have it fixed and got a call this afternoon asking me if I knew which NOX sensor it was because there is apparently 2 on my car. Of course, I have no idea - searches have shown this problem on UK 1.6 FSIs but there is nothing about there being 2 sensors.

Is there two NOX sensors and is there any way to tell which one it is?

Thanks!

[idaho]

According to SSP322 Self Study Program for the 2.0L FSI engine the NOx sensor is behind the NOx storage converter. The sensor in front of it is a temperature sensor.

[rob07gti]

Thanks idaho but that doesn't help me much, I'm a pictures and diagrams kind of guy...

Well the mechanics called back, the part will cost $1400 and they are not confident that it will fix the problem and are not willing to take the risk of buying it, discovering that it doesn't fix it and being stuck with an expensive part they will never use again. Calling VW tomorrow to book it in...

[idaho]

Google is your friend.

[Lucas_R]

Some info here about the sensor and its location in the vehicle:

NOx Sensor

Audi A4 FSI 2.0

[rob07gti]

Thanks guys, google had not been my friend so far. Evidently adding 'Golf' to the search removed a bunch of valid sites.