O2 sensor
2 Answers
sensor 1 is precat also known as an a/f sensor sensor 2 is post cat and is an o2 sensor
Racenotrice answered 5 years ago
If the sensor is causing an issue with the way the car runs it is the one in the exhaust manifold near engine if it is just a check engine light that you are trying to kill it is the second one near the catalytic converter