PAIR OF PREMIUM POST CATALYTIC O2 SENSORS TO SUIT HOLDEN CREWMAN VZ L76 L98 6.0L V8Premium pre cat O2 sensors are manufactured utilizing proven OE technology and are guaranteed to provide durable and efficient performance. The Post catalytic oxygen sensor is located after the catalytic converter and monitors its efficiency by comparing the exhaust that flows into the and out of the converter. This sensor ensures the lowest possible output of environmentally harmful engine emissions. These post cat oxygen sensors suit Holden vehicles