Oxygen Sensors
GMC Envoy
Pontiac Firebird

Where are the oxygen sensors located at on a 1999 3.8 Pontiac Firebird?


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There is one is each exhaust manifold, and one before and after convertor. The convertor can be seen if you lay on the ground and look under pass side of car. Follow that towards the front of car and you will see a pipe that makes a "y". The "Y" leads to manifolds on the drivers and pass side of car. In there you will find the sensor.