O2 Extension Harness, 27-Inch

The ZZPerformance O2 Extension Harness provides a 27-inch length to extend the reach of your oxygen sensor. This is often necessary when installing aftermarket header kits, as they typically relocate the primary (front) O2 sensor further down the exhaust system compared to its factory position near the engine head. This harness is constructed with four wires and features square plug styles, with four female and four male connections to ensure a secure fit. ZZPerformance offers different models of this extension harness to ensure compatibility with specific vehicle applications: * **Model A:** For '97-05 Grand Prix/Regal, '00+ Monte Carlo/Impala/Bonneville (front sensor application), and '04-07 Cobalt/Redline 2.0L. * **Model B:** For '04-07 Grand Prix (rear sensor application), '06+ Cobalt 2.4L, and '08+ HHR/Cobalt SS (rear sensor application). * **Model C:** For '06+ Grand Prix (front sensor application), and '06+ HHR 2.2/2.4L (front sensor application). * **Model D:** For '08 Grand Prix (rear sensor application). It is crucial to verify the specific O2 plug style on your vehicle, as some earlier models may use a different connector. For 2004+ Grand Prix models with the rear O2 sensor mounted forward, the "B" ('04-'07) or "C" ('08) extension is required to utilize the factory rear O2 sensor when installing a ZZP downpipe.