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Replacing O2 after cat sensors on a 2001 996 c2


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Check out post #49 of the following thread:

http://www.renntech.org/forums/topic/43522-p2096-porsche-fault-code-16-oxygen-sensor-ageing-delay-bank-1/page-3

You can buy those o2 post-cats on Amazon for around $100 each (OEM Bosch). You will need an o2 sensor wrench (or a 22mm open faced wrench if I recall which I found to be a lot better). Replacement is pretty easy. Take off the air filter housing in the engine compartment to access where these plug into the computer. You should be able to unscrew them from the cat from the engine compartment, if I recall (I think I did the pre-cats from underneath the car if I remember). The only tricky part is you have to feel and can't really see from doing it from above in the engine compartment.

Conceptually you will find it's a very simple job. The hardest part is there's not a lot of room to work in there and the post cat is sitting on top of the cat's drum which makes it a little ways up there in the exhaust.

Post back and let us know how it goes.

Edited by Silver_TT
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This was an easy job. This took an hour to complete and that included a trip to Autozone to get the special O2 Sensor wrench. The dealer wanted $900+ to do and they quoted 3 hrs to complete. It was tight and getting things to line up blind was a bit of a challenge. Any way after a quick 10 mile run with no CEL, I stopped at the Ferrari store where there are 2 F40's, 1 F50 ($1 mil) and an Enzo ($2 mil), there were of course, lesser 599's F430's and the like.

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Good job! Hope the information I pointed you to saved you some time. It is tight indeed and if it weren't for this it would be a 15 minute job tops. If you ever have to do it again I bet you can do it just half the time...... definitely not a 3 hour job to do for sure.

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