Engine Performance problem
2002 Audi A4 6 cyl All Wheel Drive Automatic 76000 miles
The SES light came on, Code PO431, I wanted to replace the o2 Sensors, I was told there were a total of 4 o2 sensors, two in front of the cats and two after the cats, where are the 2 rear or after the Cat sensors located? I can barely see 2 sensors (1 each side) that appear to be the front sensors, they are right in front of the Cats and just behind the manifold, where are the rear sensors located? Where can I find a diagram showing this location and instructions on removal?
FYI I already purchased @ $16 your e-auto repair manual and for the life of me can not find and info to locate and replace these.
have the same problem?
Sunday, May 17th, 2009 AT 5:58 PM