Q: When do I need to change my Oxygen Sensor?

A: Sensors should be tested at every tune up, and prior to smog checks. In California, 70% of the vehicle smog check failures are a result of poorly operating or failed Oxygen Sensors. In the interval periods, the following tips can show whether a sensor has reached the end of its service life:

• Poor fuel economy
• Higher exhaust emissions
• Surging and/or hesitation
• Rough idling
• Catalytic converter failure

Additionally, when the "Check Engine" light is illuminated (in vehicles so equipped), generally the Oxygen Sensor needs to be checked.

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