Check Engine Light
Thread Starter
Instructor
Joined: Jan 2020
Posts: 172
Likes: 175
From: Cincinnati
Check Engine Light
I got a cel while driving. I was passing autozone so used their scanner. Showed P0056, low voltage bank 2, sensor 2 and P0057 saying most likely replace O2 sensor. I got 1, but when I got under car, where sensor plugs into wiring harness it was laying against exhaust and is melted so bad won't come apart and it appears some of the wiring harness wires are also melted. So that part of wiring harness needs replaced. I can't seem to find it online. I did see what appears to be a replacement harness, 17 inches long, when going to headers. Anyone have any knowledge? I was going to do it myself, but not sure I can get to where I would need to plug into upper harness and it appears that harness also plugs into sensor 1. Just looking for some help, advise. I'd prefer a stock harness. Thx
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
I got a cel while driving. I was passing autozone so used their scanner. Showed P0056, low voltage bank 2, sensor 2 and P0057 saying most likely replace O2 sensor. I got 1, but when I got under car, where sensor plugs into wiring harness it was laying against exhaust and is melted so bad won't come apart and it appears some of the wiring harness wires are also melted. So that part of wiring harness needs replaced. I can't seem to find it online. I did see what appears to be a replacement harness, 17 inches long, when going to headers. Anyone have any knowledge? I was going to do it myself, but not sure I can get to where I would need to plug into upper harness and it appears that harness also plugs into sensor 1. Just looking for some help, advise. I'd prefer a stock harness. Thx
If you don't want to do that, then buy the extension used for headers. Cut the wires going into the melted connector. Cut the wires on the corresponding connector that's part of the extension. Splice the extension to the factory harness. I find it best to solder the splices and use heat-shrink tubing.
Thread Starter
Instructor
Joined: Jan 2020
Posts: 172
Likes: 175
From: Cincinnati
Thank you!!
Sounds like that harness for headers actually plugs into the connector that goes to O² sensor instead of the main wiring harness. That's a bummer. I was hoping I would not have to cut and splice. But still thx for info
I should have mentioned I have a 2015 ZO6
Sounds like that harness for headers actually plugs into the connector that goes to O² sensor instead of the main wiring harness. That's a bummer. I was hoping I would not have to cut and splice. But still thx for info
I should have mentioned I have a 2015 ZO6
Last edited by vette2284; Jul 14, 2023 at 08:35 PM.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Thank you!!
Sounds like that harness for headers actually plugs into the connector that goes to O² sensor instead of the main wiring harness. That's a bummer. I was hoping I would not have to cut and splice. But still thx for info
I should have mentioned I have a 2015 ZO6
Sounds like that harness for headers actually plugs into the connector that goes to O² sensor instead of the main wiring harness. That's a bummer. I was hoping I would not have to cut and splice. But still thx for info
I should have mentioned I have a 2015 ZO6
Hopefully you have a lift or a QuickJack since trying to do it on your back would be a real pain. Also....be sure to check the connectors. If I remember correctly, the aft sensor connectors are different than the front sensors.
Race Director
Joined: Mar 2001
Posts: 19,965
Likes: 6,770
From: Bonneville Salt Flats
Well, first you found out what is wrong. Secondly, from the sound of this I'd get a new connector and try splicing the wires. I suspect it will work fine, but you aren't out much if it doesn't... before doing what is likely to be much more. All the best, in any event! 
