Demon4o7

Long time lurker. First time post. So I have a 2000 silverado 4.8 l and I had an o2 connector plug lay against the exhaust pipe, melting it. So I cut / splice the wires. Ever since then I've been having a multitude of problems to which I can't trace. (wiring infuriates me) I do t know where to begin or how to start tracking the problem. As of now I have p0137 p0157 and p0332. The knock sensor I assume is genuinely bad. I drive 50 miles a day one way to work so I can't afford horrible gas milage! Also the two post cat sensors are new. Sorry if there are errors I did this on my phone. I cam get a freeze frame from torque if need be. Thanks in advance!

MDTAHOE

The power for the heater circuit in the o2 sensors are fuse protected. If the wires melted they grounded out on the exhaust and the fuse is surely blown.

Demon4o7

Is that under the hood or drivers dash? Would b1s2 share the same fuse as b2s2? Also do you know what fuse it would? Thanks for the reply!

Demon4o7

Well I found o2A and O2B. Both fuses were fine. Now it's saying both b1s2 and b2s2 have low voltage! It's aggravating! Any help??

67Motorcat

Replace the damaged pig tail with a NEW one.
Disconnect the battery for 5 minutes.

Your problem will be fixed bearing nothing else is wrong.

Demon4o7

Where does one find a NEW pigtail? Also. How do i know if it's wired correctly? That's kinda where I'm at now. Are there common vacuum leaks that appear?

Demon4o7

Well I unplugged the battery and the code went away. But upon restarting (cold) it was a very low idle and wanted to die then the same 3 dtcs came back up. Idk what to do.

67Motorcat

You will have to buy a new 02 sensor.
The pig tail wires are not available separately.

Visually check ALL your wires/hoses/Vacuum lines and their connections for faults.

The ECM is very smart and is telling you something is wrong.It is up to you to systematically investigate each probable cause and by process of elimination,you will find the cure.

Demon4o7

Well I did by a new o2. Both sides. But the ecm side of b1s2 melted too. So the new o2 pigtail is useless. I've visually checked the motor pcm grounds Maf and intake vacuum lines and nothing seems wrong / damaged. I don't know where to begin as far as trouble shooting.

MDTAHOE

Did the body side of the harness melt bad enough that the wires came out?