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Old 01-25-2012, 08:39 AM
shertex shertex is offline
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,919
Quote:
Originally Posted by mbdoc View Post
If there isn't any LED & pushbutton on that diagnostic connector?
then the ONLY way to diagnose a problem is by watching the duty cycle.

Check engine light on a non-California car is for lack of O2 sensor activity.
What is meant by "watching the duty cycle?"
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