The optional exhaust gas oxygen sensor must be mounted in the exhaust pipe near the exhaust header or extractors, usually after the collector. The sensor uses the exhaust gas to detect if the engine is running lean or rich. Many late model engines already have provision for an exhaust gas oxygen sensor and the sensor provided should fit any standard exhaust mount. Some exhaust systems have the sensor mount up to around half a meter (2 feet) down stream from the exhaust headers. If the exhaust system does not have an existing sensor mount then a new mount will have to be welded to the exhaust system. When routing the electrical connections to the exhaust gas oxygen sensor, do not allow the harness to touch the exhaust pipe, as the heat will damage them.

Narrowband O2 sensors can be wired directly to AVI inputs 1 and 6 which have been optimally designed to minimise the load on the 0V to 1 V signal produced by this type of sensor.