I replaced my O2 sensors about three weeks ago for the third time; got fed up and took it to my usual shop and they ended up putting OEMs in there (I tried cheapies for a little while). In the meantime, got a power steering leak from the pump and fixed that; found out that my O2 connection on the driver side was covered in power steering fluid, so I cleaned it up after I replaced the pump. No more leak, but the O2 sensor code keeps coming back and it's now joined intermittently by one from the other, passenger front O2 code. Both report low voltage.

No melted or cut connections that I can see, and no vacuum or exhaust leaks that I've been able to find. Anyone have any ideas? I checked some threads in here but most dealt with aftermarket headers (I'm running fully stock). The voltage is fluctuating but somewhere between the 0.03 and 0.05 range; the other O2 sensor's code has gone away (for now) and it oscillates between 0.09 or so and 0.9.

Thanks guys.

 

here is some good reading on O2 sensors
http://autodiagnosticsandpublishing....r-testing.html

 

Thanks; I wasn't sure exactly what the voltages meant beyond functioning-or-not, so that was useful.

Gonna take a look at the grounds (they looked fine when I last changed the O2s but who knows) and hope it's not an open circuit instead. If it is an open circuit, I assume that it'll be on the plug side and not on the sensor side based on how many different O2s have failed?

 

Took a look at the ground (or what I can only assume is the engine-block ground); seems intact. The ground is on the driver side below the head, correct? Just making sure I haven't been looking at something else this whole time.

There's a long strip of... plastic? Maybe flat wire in some kind of sheath? that runs from where the ground bolt is to another bolt near the front of the car; it's electrical-taped and runs parallel to the O2 wiring where it connects to the rest of the harness before splitting off and bolting to the front. No clue if this is some kind of makeshift secondary ground or some kind of weird support; the prior owners did weird **** with this car.

Either way, I think I'm going to end up chasing an open circuit; always a pleasure...

 

Phone died and moved my post somehow. Disregard this post.