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I just recently had my Porsche mechanic replace an oxygen sensor becuase a code indicated that there was a problem with the rear passenger side sensor. I scheduled an appointment the have it changed but the day before the change the "CE" light went out. I had him change the sensor

Two weeks later I have a check engine light again! I suspect when I have my mechanic check the code it is going to tell me that I have another bad oxygen sensor ($150 for one) .

1st Question- How many Oxygen Sensors are there and where excatly is each one located ?

2nd Question- Do these things all go bad this often?

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There are two per catalytic convertor. One before and one after each cat -- for a total of four per car.

Many times other faults (i.e. MAF, loose gas cap, bad bellows tube, etc.) can trigger a bad reading at the oxygen sensor. The oxygen sensor reading bad is perhaps a result of some other problem up stream. If there is a "P" code fault then all the possible causes of that P code should be explored (IMHO).

Sometimes they go bad -- but sometimes it is because they got oil or water on them and they get damaged easily.

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If you want your own OBDII test hardware/software prices start at $125 and go to $10,000. I happen to own the $125 software and cable solution that runs on my laptop. It all the standard OBDII diagnostics and has access to some of the Porsche specific diagnostics. You can find more info here.


I get my P code list along with a troublshooting tree from AllDataDIY.com. About $24.95/first year for the first car and $14.95 for additional cars and renewals.

If you are looking for a good shop in your area... I am not sure exactly where you are located but Steve Weiner at RennSport Systems in Portland has a very good reputation. His contact info is: 503-244-0990 or porsche@rennsportsystems.com

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Thanks Loren. I think I am going to purchase one of these today.

Yes, I know Steve at RennSport (see him at the track often...GREAT GUY) however, I am pretty loyal to my mechanic at A&P Specialties who has worked for Porsche almost 20 years and been in busines for himself working on Porsche for another 15. Sorry, I did not mean to give the impression I was ditching him. I would like to start diagnosing and repairing more of these things on my 996 myself

becuase I enjoy doing it and simply hate paying someone to enjoy my ride on the rollercoaster ;) .

That is why I keep copies of all of the stuff you've posted on your DIY website hanging in my garage on a clipboard...Dude you have be a great resource and contributor to my weekend fun!

Thanks :thumbup:

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