I have a 2021 accord 2.0. Recently installed plr intake, down pipe, and front pipe. The down pipe “relocates” the o2 sensor lower than the stock so it comes with about a 4” harness extension which I lost when I first installed it. I’ve had it installed for about 3 weeks I am now just getting a p0137 code. The harness stilled reached without it but It did have some tension on it so I am looking for answers wether or not it pulled a wire or if the down pipe it’s self is causing a faulty code. It is a catted down pipe. I have looked everywhere for a wiring diagram for the o2 sensor. What I need to know is which two wires are for the heater and which two wires are for the sensor it’s self.

 

On the O2 sensor side, the purple and white wires are for the heater, and the green and the blue wires are for the sensor.