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There are two (minimum) in the exhaust systems on late model cars and light trucks.

They are installed before and after the catalytic converter as the gas flows through the system. Thus pre and post "cat" (Catalytic Converter)

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13y ago
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5mo ago

"Post-cat" refers to an oxygen sensor located after the catalytic converter, while "pre-cat" refers to an oxygen sensor located before the catalytic converter. The post-cat sensor monitors the efficiency of the catalytic converter, while the pre-cat sensor helps regulate the air-fuel mixture before it reaches the converter.

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Q: What does Oxygen Sensor Post-Cat and Pre-Cat mean?
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