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Originally Posted by psuball1
The O2 sensors are next on the list. If the check engine light does not come on is it still possible to have a defective O2 sensor? Is there a way to check them?
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Yes, it is possible. The only way to check the sensor is to plug into the OBD system and read the output of the sensors. They change their voltage output to change the volume of air in the fuel/air mix. You have to see if the output voltage is going up and down along with the up and down changes in the idle. AutoTap does those readings.
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