Hey all, I recently ( 6 months ago) replaced my beaten and busted header and olde O2 sensors with fresh equipment. Before I had an evap code but didn't bother looking into it as my header was leaking badly. So as I mentioned I replaced the lot and now I've got 2 codes dancing on my dash;
P 0 135 - O2 heater circuit- Bank 1 sensor 1
P 0 131- O2 Circuit low voltage- Bank 1 sensor 1

Doing the install was relatively easy for me, no wire extension, 1st o2 into the header and second behind my cat. Any thoughts here? I'm trying to dig up a used but working sensor for diagnosis but I don't live in a tibby enriched environment.

Also I have a sort-of bog at above 3000rpm until about 4700rpm. Not sure if that is related. I notice that if I lay it to the mat it doesn't happen, when it does it really push off from 47000. I am running a 1.8 ECU I bought from a member here years ago.

 

check the connectors are wired right and that the guy at the parts store gave you the right stuff.

Also a thread title with something about cel's or the first o2 sensor might attract the eye of an expert. just a thought

 

Your first O2 sensor is eithe f'ed up or not even connected correctly. Check the connector plugs and then clear your ecu and see if they come back.

 

Your first o2, is it in a runner or farther down in the collector? If its not in the runner then get a o2 bung welded in the runner closer to the engine so the sensor gets the proper readings. The stock position is in the manifold.