tmc2k1

iTrader: (4)

I am throwing the code P0137

Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

This is the O2 sensor for the catalytic converter. I currently have 59k miles on the car and I got a Magnaflow high flow cat around 40k miles. It seems kind of weird if it is my high flow cat that is messing up. I haven't changed any of the O2 sensors yet. I don't want to change the O2 sensor for the catalytic converter if the code wont go away. I know that this O2 sensor is to just tell if the cat is functioning properly and serves no purpose otherwise.

With that said. How can I determine if its the high flow cat that's the problem or the O2 sensor? Thanks!!

LS6427

iTrader: (2)

Swap the sensor with one on the other side, see if the code changes sides.

Then have someone tune out your rear 02 sensors.

.

ArkBird96

Definitely O2 sensor or something electrical in my opinion. From what I have heard, if the cat is bad, you will set either P0420 for the driver side or P0430 for the passenger side.

Also, if you have aftermarket high-flow cats, those can throw codes. But like LS6427 said, you can either run O2 sensor simulators (get them from one of the sponsors I think) or either tune out the tests for the code you are getting as well as P0420 and P0430, or have a tuner do it.

biggb1783

o2 sensor.

tmc2k1

iTrader: (4)

Yeah, P0420 threw when I got the high-flow cat. I got that tuned out shortly after.

Yeah, I didn't think it could be the cat. Ill swap the O2's and see if the code is still there. Thanks!

wssix99

iTrader: (5)

Not sure if you have ever done this before, but you will need to use anti-seize compound on the sensors when you swap them. (New sensors come with this stuff pre-applied.) If you don't use it, they will fuse to the pipes and will never come back out again.

tmc2k1

iTrader: (4)

I also forgot to mention that the SES light will go on and off. It will sometimes go on for 100 miles and then be off for maybe 20 miles. Then it will come back.

I heard from some people that the O2 sensor could just be confused because its a high flow cat and not the stock one. What do you guys think? I wanted to mention in coming on/off because I'm sure thats an important detail. I just dont want to buy a new O2 sensor and I wasted the money and still get the code.

Any other thoughts?

tmc2k1

iTrader: (4)

Any input on this? I am not sure if I should get an O2 sensor or an O2 simulator. Anybody have luck with the simulators before? I just want to be sure the code is gone.