P0036 HO2S Bank 1 Sen 2 Heater Circut

I went to change my exhaust, couldn't get the midpipe off and the rear was already off (aftermarket)...drove the car home without the rear section and the light came on.

I figure no problem, I'll reset it when I get the new exhaust on

New exhaust is on, I reset the light, start and drive for a bit...no light

Turn the car off and right back on...light (same code)

Done this 4 times now

-Also have an air/fuel gauge (just for monitoring) on the o2 sensor, but it was there for 2 weeks before the light came on w/no problems


ideas?

 

Mine came on when I turned on the AC. I have an aftermarket header and cat back. Been driving it for 2 weeks and had no lights. I am going to reset it and see if I can repeat the scenario. I might need to add the adapter for the o2 sensor I got from MMania.

 

I'm going to end up putting a sim in there and run the wideband if I can get my hands on an autometer wideband gauge

 

You don't need an O2 sim unless you have a P0136 code. P0036 heater circuit usually suggests one of the heater wires to the rear O2 sensor is broken (during exhaust installation or chewed by rats), the A/F gauge is wired wrong (heater ground instead of sensor ground? ...and on the rear O2 sensor too, where it wouldn't work too well ), or the heater circuit has opened internally. This circuit may be replaced with a 20 watt, 20 ohm resistor.

Even with an O2 sim you'd still need either the resistor or a working rear O2 sensor heater circuit (doesn't need to be screwed in the exhaust) to avoid tripping a P0036. The computer will detect problems with the continuity of that circuit and trip the P0036 immediately, rather than the two drive cycles that are needed with P0136.