Oxygen Sensor Warning Light

[smartguys]

Follow up question:

Do I need 2 or 4 replacement sensors. Many auto parts stores online say 4 per car?

thanks/Kelly

[blue2000s]

Originally Posted by smartguys

Follow up question:

Do I need 2 or 4 replacement sensors. Many auto parts stores online say 4 per car?

thanks/Kelly

The pre-cat sensors see a much more harsh environment from a contamination standpoint than the downstream sensors. They are also the only ones that will actually effect the air/fuel mixture. The downstream sensors just tell the DME if the cats are working correctly. You might try replacing just the upstream pair first and see if that fixes your problem.

[Dohertycm]

Dont throw parts at it...

Look make the investment and get you a diagnostic tool so you can read the codes....and if you dont have one, get a Bentley manual.

I got my code reader off of EBAY. A CAN ODBII reader...

It can read all of the codes and with the bentley manual you can look up the Porsche codes.

Although my mechanic tell me that he has changed out very few O2 sensors because he has found air and vaccum leaks and also MAF problems...

However, in my case I had the 1053 and the 1276 code which pointed directly to one sensor.....$114 dollars it cost me for the OEM replacement...

But dont throw parts at it, it will only frustrate you more.

Chris