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O2 Extension Harness

Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness

Most header kits will require this because the primary (front) O2 sensor is mounted further down the header rather than right next to the head like it is mounted in the factory rear manifold. All of our o2 extensions are 27" long.

Different models:

A. '97-05 Grand Prix/Regal/'00+ Monte/Impala/Bonneville (front), '04-07 Cobalt/Redline 2.0L

B. '04-07 Grand Prix (rear), '06+ Cobalt 2.4L, '08+ HHR/Cobalt SS (rear)

C. '06+ Grand Prix (front), '06+ HHR 2.2/2.4L (front) 

Please verify the style of O2 plug you will need by looking at your actual plug on the car. Some early model cars have used the previous model O2 plug.

The 2004+ Grand Prix rear O2 is mounted far forward, so when you install a ZZP downpipe you will need to pick up the "B"('04-07) & "C"('08) o2 extension so you can use the factory rear O2 sensor.

Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness
Wire Harnesses & Adapters - O2 Extension Harness
Customer Reviews
4.9 Based on 105 Reviews
5 ★
90% 
94
4 ★
10% 
10
3 ★
0% 
1
2 ★
0% 
0
1 ★
0% 
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JS
12/15/2021
Joyce S.
United States United States

Great company but

Great products. Website and references are very helpful. Only issue is that I bought the recommended O2 extender but it did not fit the factory harness. This was easily fixed with a little modification of the male end of the new harness

WB
09/20/2021
Whiteboi B.
United States United States

Didn’t need

Already had made one in the time it took to come

BE
06/02/2021
Benjamin E.
United States United States

O2 harness

It what you need if you do the downpipe from zzp fit perfectly just wish you have kits that come with everything like ex. If you get a downpipe have a window that say you well need this and you can check a box yes or no it hard trying to find everything

TM
05/16/2021
Thomas m.
United States United States

Works great

It was great, simple and easy to install. A+

ZZPerformance O2 Extension Harness ReviewZZPerformance O2 Extension Harness Review
AB
03/26/2021
Amber B.
United States United States

Very Helpful

This extension harness was extremely helpful when installing the ZZP downpipe on my Grand Prix. The o2 sensor was relocated on the new downpipe, and this harness made it very easy and painless to do it.