New cat in the car, but rear heater circuit is giving me troubles now.

Anyone know what resistance the circuit is supposed to be, and what wires it should be?

 

Fun fact: Until now, I never realized that there was a different spec for the O2 sensor heater resistance on front vs. rear in the '01+ cars. That's fairly unusual.

 

Very cool, thank you. If I run a wire with a 15.7 ohm resistor, between the rear C&D, that should do it. I think.

Edit: 15.7 ohm, no such resistor exists. Maybe a 15 will work?

 

I honestly don't know if that will work, I've never tried it.

Resistive heating elements have the characteristic that their resistance increases as they get hot, and thus the current flowing through them decreases (for a given voltage.)

If the ECU is looking for this current-curve behaviour, which it should be, it'll still throw a code.

If you wish to experiment, be aware that the resistor will dissipate around 15 watts of power, and will get very hot.

 

The resistor worked. Just for anyone looking this up. It let me troubleshoot in a new O2 sensor.