Bapmic 234-4337 13444 12578459 Oxygen Sensor Upstream/Downstream ASG277 for 1996-2004 Chevrolet GMC Cadillac Review

In the product description there is an upstream and a downstream. Got 2 downstream so now I have to buy a separate upstream after already paying for 2.

I didn't like the fact that after ordering the top and bottom oxygen sensors, my package came with two BOTTOM O2 sensors. Was issued when I got to the mechanic. CM.

This was NOT for my 2003 S10 but for the previous year or another S10. It worked downstream through a plug, so instead of messing around with the return and finding the right one, we plugged it in, which I couldn't find anywhere on Revain, even after tweaking my truck's parts. I had to go through local ones.

If you have a socket on the wire harness and a socket on the sensor they won't match up like they should - it's PIA to rewire the whole wire - especially since the car's color coding matches doesn't match the color coding of the sensor - generally spent a lot of time getting it to work - it's easier to buy an OEM sensor that plugs into the existing wiring harness.