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Discussion Starter · #1 ·
If theres some version of Hell for cars, Im in it. Both my daily driver and my V have issues caused by wires under the car to sensors getting damaged. With the V the front bank drivers side oxygen sensor has melted against an exhaust header. I've already bought new Denso sensors but the problem is its broke at whatever the harness the oxygen sensor itself plugs into. It would be an absolutely royal pain in the ass to get that far under the car to try and splice it- if thats even possible so can anyone point me to whatever harness it is the oxygen sensors plug into? With my luck it will be some main harness with 15 connections GM wants 4 figures for.
 

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You said headers? Are they plugged into the extension harness for long tubes or is the factory plug melted?

If the factory plug is toast and the factory wires look usable, an easy fix would be to grab another extension harness and relocate the plastic plug onto the factory wires. You’ll need to source the correct pins or monkey with removing the said pins from the extension.


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Discussion Starter · #3 · (Edited)
You said headers? Are they plugged into the extension harness for long tubes or is the factory plug melted?

If the factory plug is toast and the factory wires look usable, an easy fix would be to grab another extension harness and relocate the plastic plug onto the factory wires. You’ll need to source the correct pins or monkey with removing the said pins from the extension.


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I didnt think about it possibly being an extension. I bought the car already modded. Pretty sure its long tube headers to 3 inch pipe all the way out the back to factory mufflers. No cats. Any good way to tell if its an extension or the factory harness?
 

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If you have long tubes most likely it is an extension.

Trace the connector back up to the back of the motor/ transmission, and you’ll find another connector like the melted one. If not you’ll have some work to do.

Worst case cannibalizing an extension connector and retrofitting it to the factory harness should be doable, but you’ll be working in pretty tight quarters.

You are looking for this location



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Discussion Starter · #5 ·
If you have long tubes most likely it is an extension.

Trace the connector back up to the back of the motor/ transmission, and you’ll find another connector like the melted one. If not you’ll have some work to do.

Worst case cannibalizing an extension connector and retrofitting it to the factory harness should be doable, but you’ll be working in pretty tight quarters.

You are looking for this location



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Jfc that picture is so helpful. Thanks a ton. There are no youtube vids of people fighting with this and Im doing this blind and solo. I get to choose between being able to shine a light to where I can see where I need to be pulling or just touching the connector but never both at the same time.
 

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2011 thunder grey coupe a6 recaros.
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Any idea on whats my best bet for finding a brick and mortar store that would have an extension? Trying to get the car mobile by tomorrow and not have to wait on shipping from a speed shop.
Amazon
 

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Casper electronics had 24" extensions in the stock last time I checked.

Also Chris @Crawford-Racing can make extensions for any length / application.
 

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Discussion Starter · #11 ·
Where do you live?


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SC
Yeah thats where I placed an order since Im probably OOL otherwise. Hopefully LS1 compatible also means LSA compatible extensions. Ordered these-
 

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2011 thunder grey coupe a6 recaros.
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That’s what I bought
 
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Discussion Starter · #19 ·
Man I swear the more I mess with this car the less I know. The car has heads, cam, pulleys, intake, E85, full exhaust with no cats, etc and I don't know what is stock and what may have been jerry rigged or modified by the shop that did all the work on the car with the previous owner. I found the location from Sbchris's pic. Do all 4 oxygen sensors route into that plug and tube from that pic? Around that area there are 2 disconnected oxygen sensors one of which looks cut. I'm guessing these are the rears since the car does not have cats. Theres also a harness that has a broke wire that I'm guessing could go to one of the oxygen sensors I'm including pics of. A lot of the wires are wrapped with heat shielding that looks different from stock and I can't tell what may be aftermarket or spliced into- if anything.

The first pic is just of the central plug up top with a d/c oxygen sensor. The second shows both disconnected sensors as well as the broken wire just above and to the right of the disconnected sensor. All I've done is unthread the oxygen sensors out of the headers under the car so anything disconnected up top has been that way since I've bought the car in March. This is why I'm assuming they're the rears since the car has been mostly fine until the O2 sensor codes.

The frustration is I can't get to the damn disconnect point under the car to put a new oxygen sensor in and I can't even see where the damn things route up top to try from the top of the motor.
 

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