I was looking at RockAuto, shopping for a set of upstream O2 sensors, and see they talk about fitting the GLE? Others have notes referencing the OEM part numbers.

How are these sensors different? Are they a different part entirely? or just a different length wire (or some other insignificant difference)?

Thanks

 

All upstream sensors (for our cars) are interchangable. If you have a Fed spec max you only have TWO. If you have a Cali spec you have three. You can easily tell by the vin or by the number of connectors you have on your UIM near the right of the plastic cover. The GLE parts will work with any trim. you just have to be sure that your issue is UPSTREAM or DOWNSTREAM past the Cat

 

oh and by the way I recommend the Denso's. put mine in and never saw those stupid codes again.

 

Does the downstream do anything other than set off the CEL if the CAT is not working properly?

 

Interesting, Rock Auto lists both "upstream" and "downstream", Front and Rear.. Implying there are 4 sensors..

 

Incorrect. ALL 4th gens, Fed and Cali have TWO UPSTREAM sensors...the difference is in the DOWNSTREAM. FED have ONE downstream, it's after the MAIN CAT. CALI has TWO downstream, one after each pre-cat.

For CALI spec there are 4 sensors.

 

Thanks. It is the UPSTREAM sensors I need, so I just ordered 2 of them from Rock.. Hopefully they get here before the weekend.

 

I ordered two upstream ones a few weeks ago and with regular USPS I think I had 'em in like 3 or 4 days, and I'm up in Seattle.

 

Thanks for the correction, I was checking the PDF file when I was posting but Boss man came in before I could verify. I knew the numbers were good. just cloudy on the locations. I'm running Fed spec luckily. Only seen pics of Cali specs in the FSM.

I second the notion on quick shipping. I ordered on a monday and they were there Thursday evening.

 

Well I have a very early 95 and it is cali with only two upstream and 1 downstream. Even the guy at dealer found it very weird that even my evap canister does not have a vent valve. So in my case, I am a rare case with only 3 O2 sensors all together and it is a cali version.