Between chasing a misfire and an O2 code I've got some questions before I burn money on something that won't solve the problem.
My current code is p0140. This is the rear O2 sensor post cat if I have the correct info on the code as we don't have a sensor 3. Besides emissions what is there another function of this O2 sensor?
The front O2 sensor is behind the wheel well and not related to that code at all that I know of. If I understand it's purpose is reading AFR for the ECU for fine fueling adjustments. Per Cobb and Subaru the code I have currently is a problem and will cause AFR issues, but I don't understand how if it is for the sensor 2.
I'm going to get under the car this weekend weather permitting and look for loose connections, or chaffing of wires. I don't want to dump money into replacing the wrong sensor. Are there some other things I should look at to address this code?
The code only appears after a very long idle 10 minutes or so, and only when a stage 2 ots map is flashed. If I put the factory tune back on it on idle I get no code appear. Cobb thinks it's a faulty O2 and calling Subaru locally 1 out of 2 dealerships agree. The other says it's because of the aftermarket downpipe. My assumption is that should kick out a different code relating to the rear catalyst.
Any further information would be handy.
TL/DR:
What can cause p0140 O2 code, what should I check and what O2 sensor is it? What does each sensor do specifically?
Sent from my SAMSUNG-SM-G935A using Tapatalk
My current code is p0140. This is the rear O2 sensor post cat if I have the correct info on the code as we don't have a sensor 3. Besides emissions what is there another function of this O2 sensor?
The front O2 sensor is behind the wheel well and not related to that code at all that I know of. If I understand it's purpose is reading AFR for the ECU for fine fueling adjustments. Per Cobb and Subaru the code I have currently is a problem and will cause AFR issues, but I don't understand how if it is for the sensor 2.
I'm going to get under the car this weekend weather permitting and look for loose connections, or chaffing of wires. I don't want to dump money into replacing the wrong sensor. Are there some other things I should look at to address this code?
The code only appears after a very long idle 10 minutes or so, and only when a stage 2 ots map is flashed. If I put the factory tune back on it on idle I get no code appear. Cobb thinks it's a faulty O2 and calling Subaru locally 1 out of 2 dealerships agree. The other says it's because of the aftermarket downpipe. My assumption is that should kick out a different code relating to the rear catalyst.
Any further information would be handy.
TL/DR:
What can cause p0140 O2 code, what should I check and what O2 sensor is it? What does each sensor do specifically?
Sent from my SAMSUNG-SM-G935A using Tapatalk