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You will be happy with the tune. Mine had the light coming on and it was setting the code for the the front O2 sensors not switching because of the LT headers. Jannety tune will disable the front O2 sensor and it will never be a problem again. My CEL would go off about every two to three days, the onstar folks said it would after about seven start ups with full cool down and warm ups. So it is normal for it to see the switching come back and then turn off the light. Also if you have a L99 the remote start will not work if the CEL is on.
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