Oxygen sensors measure how much unburned oxygen is in the exhaust so the computer can fine-tune the fuel mixture.
Why It Matters
A bad sensor wastes fuel and can damage the catalytic converter, which costs much more to replace.
How to Save Money on Oxygen Sensor Replacement
Most cars have 2 to 4 sensors, only replace the failed one(s) not all of them
Denso, Bosch, and NGK make the sensors that come on most cars new
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