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Did you have them put in new O2 sensors when the headers were done? If not, I would get new sensors. Breaking an O2 sensor loose will often lead to it's quick death! If the headers were coated, then maybe the coating burning off has contaminated the O2 sensors. And to add to that, one of my new AC Delco O2 sensors started giving me a heater circuit code within 6 months as well.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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