I am considering a switch to a 16168625 PCM from a my ECM 16144288 with BCC BARL but would like to get things running smoothly before making the switch.

In order to ease installation, I added a 6" wire patch in the O2 sensor wire between the sensor and ECM. I am now experiencing engine problems, Code 45--Rich Exhaust once the ECM switches from OPEN to CLOSED loop. I am wondering if this extension is messing up the sensor readings to the ECM.

Thank you in advance.