Returnee to the Forum with basic question

[57 Handyman]

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.

[steveo]

it definitely could, you generally don't want to open the o2 wire itself... lets see a picture of the splice

[57 Handyman]

Steveo,

If I recall correctly, I used butt connectors for the spliced in portion. Also, in order to not create a bulge in one location, I staggered where I put each connector.

In retrospect, I am thinking I should redo the splice and solder rather than use butt connectors, then individually shrink-wrapping each wire. Hopefully, this redo will cure the Code 45 problem.

Any additional thoughts?

[steveo]

In retrospect, I am thinking I should redo the splice and solder rather than use butt connectors, then individually shrink-wrapping each wire. Hopefully, this redo will cure the Code 45 problem.

"An oxygen supply inside the HO2S is necessary for proper HO2S operation. This supply of oxygen is supplied through the HO2S wires. All HO2S wires and connections should be inspected for breaks or contamination that could prevent reference oxygen from reaching the HO2S."

- GM service manual for DTC45

o2 sensors measure the difference between reference oxygen and exhaust oxygen. basically don't cut that o2 wire open or you risk screwing up your o2 readings.

[57 Handyman]

Steveo, thanks for your responses.

Now, I am a bit perplexed. Based on this information, once the harness is manufactured, installed in a vehicle, and connected to an ECM, any damage/breaks/contamination to the original wires between the O2 sensor and the ECM will be detrimental. I find that hard to believe and, more so, that there is no remedy or way to address this.

To clarify, I have not cut or damaged the wires between the newly installed O2 sensor and the male plug. My splice was made between the female plug and the ECM. Time for me to do some spark-chasing with a VOM.

Thanks.

[57 Handyman]

Steveo, just to make sure my patch was making good connection, I removed the butt connectors, soldered the wires, and shrink-wrapped each wire individually. Lastly, I did a big shrink-wrap of the area to seal it off.

Thanks for your assistance.