Question:

How do i know if my car's oxygen sensor needs to be replaced?

Your car's oxygen sensor may need to be replaced if you notice a decrease in fuel economy, rough idling or stalling, failed emissions test, or the check engine light is on with a diagnostic code indicating a problem with the oxygen sensor. You can also use an OBD-II scanner to check the oxygen sensor’s voltage output values which should be between 0.1 and 0.9 volts.

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