Hello, I have a 2006 Honda CRV that just had its catalytic converter stolen. Since having the exhaust repaired, and two new o2 sensors installed, I'm getting the p0135 code for the front o2 sensor. It didn't have this code before the catalytic converter was stolen. I ordered a second new Denso sensor and that was not the issue. When I erase the code, it comes back on immediately. It's like the system know there is an open circuit or something immediately?

I checked voltages and resistance on the harness (car side) of the sensor clip with the ignition on and got these numbers:
Red to White - 10.1 Volts
White to Yellow - 10.5 Volts
Yellow to Red - 240 Ohms

Are these numbers normal? I'm thinking the harness got messed up if the cat was hanging from this connector when it was being cut off. Also, is there a fuse for the front oxygen sensor? If so, where is that located?

Thank you!



Harness connection for front o2 sensor. Colored lines show location of green, yellow, red, and white wires.

 

No ideas? Dang. The local shop wants $130 for a diagnostic fee, which I guess is better than me trying to be an electrician. Thanks!

 

If the wiring is damaged then the code will come up. You will need to find which wires are damaged and repair them.

 

Chris, thanks for the reply. Yes, I agree that a wire is damaged. I was hoping the 10 volts readings across the different terminals of the harness for the o2 sensor may be a clue for somebody more knowledgeable about these circuits than myself. I did locate the possible fuses that would have been bad, they were all good. At this point, I have dropped the car off with a reputable independent shop. I will report back what the issue was. Thanks!

 

So I took the car to an independent shop and they have figured out that when the catalytic converter was stolen, it somehow shorted out part of the ECM. Their thought was that when the sensor was yanked or cut off, the exposed wires shorted the ECM. The goal now is to find a used ECM and someone to program it so that it works with the chip in my key. I'm guessing the Honda dealer could program it too.