24" 02 Oxygen Sensor Extension Harness Oxygen sensor extension cable for GM LS1 engines including the 1998-2002 Camaro Z28/SS, Firebird Trans-Am with the LS1 engine. When you install most aftermarket headers, it moves the oxygen sensor bungs towards the rear of the car, farther from the factory harness, so extensions are required. These extensions make the installation hassle free by not having to cut and splice the factory wiring. It also makes removing aftermarket headers much easier. This is the Black Square 4-pin plug. It is different than the Gray Square 4-pin. These oxygen sensor extensions will make for an easy installation and will avoid the problems of faulty O2 sensor readings that are common with cutting and splicing. These are a must for any long tube header installation!