dwang

I called Shokan to order a O2 sensor for my 96 A6Q and they asked me if I knew which one of the four sensors was faulty. They told me that the fronts and rears are different and I would have to order the correct one. Any way to tell? Do all of them tend to go out at the same time? Should I just order 4 and do them all at once?

Thanks,
Dave

A6Gary

VAG-COM or other scan tool is needed to ID which one is bad.

audijim113

There is an easier way, you use an analog (one with a needle) volt meter and put it across the O2 leads. I can't remember if you put it on Ohms or measure voltage, but you do it when the car is cold and watch how much the needle swings as the car warms up.

I'm sure someoen else knows for certain about the details.

beep-beep

99%, you will need to replace front sensors. And you need to replace them as a pair. So just get two "three wire" sensors and call me when you get them.

dwang

Thanks!! I will order the 2 front generic Bosch sensors and give you a call when I get them.