I quoted this from the denso website, it is a good general rule:
Quote:
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Originally Posted by densoproducts.com
Why and When do I need to change my oxygen sensor?
Failed and/or poorly operating oxygen sensors can cause a substantial drop in fuel economy. In addition, exhaust emissions can increase dramatically, and poor driveability may also result. Catalytic converters can also fail due to increased emissions.
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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10-21-2010, 11:35 AM
