Installing the Oxygen Sensor
For engines not already equipped with an oxygen sensor, a threaded adapter must be welded into the exhaust system in a location where the sensor can monitor all exhaust ports. The oxygen sensor must be located upstream, and as close to the exhaust ports as possible. Make certain that the sensor feed wire does not become burnt by the exhaust temperature. Stainless line shielded wire can be used for this purpose.
Adapter Pipe
An Adapter Pipe with a threaded fitting for the oxygen sensor can also be installed between the exhaust header and the muffler. This requires no welding and can be removed at any time.
