2G P0135 O2 sensor heater circuit malfunction

[calreef18]

Hey guys, I'm trying to figure out how to fix this code. When I did my turbo swap I just cut and resoldered the o2 wires, but now the voltage doesn't cycle, should I try and redo the connections? I've still got the oem o2 sensor so I did black to black for the black wires, and then blue to blue and white to white. Any input would be appreciated. Thanks!

 

[calreef18]

The voltage raises with throttle, but never cycles. Any ideas?

 

[BISHILVR]

If you roughhoused the sensor at all its probably dead. It just sounds like a dying sensor to me, maybe contaminated.

 

[calreef18]

Hooked it up to another o2 sensor that I bought and it still does the same thing. Do you know where the heater circuit is located so I could check that too? I tested the heating wires and I'm getting 12v, fwiw.

 

[calreef18]

Test drove the car for a bit and the timing and fuel trims are all fine,the o2 sensor voltage just keeps reading low, anywhere from .00 to .14 at its highest.

 

[BISHILVR]

The heater circuit is internal to the 02 sensor (two black wires) If you have 12v at the plug then your good unless you have a bad o2 sensor. Are you sure that you are logging the right o2 sensor? I have my rear one hanging, and if I log it instead of the front, I get the steady readings like you are getting.

 

[calreef18]

Yea This is the front o2, I've got the rear logging also and its 0 since I took it out with the new downpipe I put in. I guess I'll go try and buy a brand new o2 sensor that plugs into the car, the other sensor I have is used but I was told it was in working condition. Would I be able to hook up the new 02 sensor without putting it in the bung and just see if the voltage will cycle? Also, is there a heater circuit relay somewhere on the car? I appreciate all the help man.

I ordered a new o2 sensor since even though this one cycles a bit when warmed up, it doesn't cycle quite as fast as normal, and the voltage never peaks right in WOT.

 

[BISHILVR]

The heater circuit iirc gets its voltage from the ignition switch/mfi relay, so if your engine is running you should have voltage to the o2. The o2 wont cycle much if its not in the exhaust stream.

 

[luv2rallye]

This may be of some help: http://www.dsmtuners.com/forums/showthread.php?t=245283