You sometimes can test an O2 sensor in the vehicle with the engine hot (normal operating temperature) just after shutdown, but for our purposes (and more accurate testing) we’ll bench test the unit.

How do you know when your car needs an O2 sensor replacement? Here are the signs of a faulty oxygen sensor to look out for!

The ceramic core of the converter could melt if it reaches a high-enough temperature, which could cause a restriction and eventually clog the exhaust. A new O2 sensor is about 10% to 20% the cost of a ...