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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 24420" data-attributes="member: 11733">O2-A and O2-B 15amp fuses are good. Now, I cleared the codes last night when I got home. After checking the fuses I plugged the scanner back in and fired it up. The heater codes are back pending after the first cold startup. I cleared them again, shut the truck off and then started it back up. No code. Drove to the gas station, shut it down and restarted, nothing pending. I think I cycled the key another two times on this test drive, and then hopped on the freeway. I was watching short term fuel trim and O2 voltage. Anyway, no stored codes after a 20 minute or so drive and the 'readiness monitors' are nearly all green.[ATTACH]3591[/ATTACH]I am assuming the O2 heater function is only triggered on cold start. I'll let it sit for a few hours and try starting it again to see if the codes come back. I am starting to lean towards these O2 sensors being faulty. Fuses are good and the only change I made was the sensors themselves. Prior to that the heater functionality was fine. I ordered some Delphi sensors from Amazon which should be here Sunday. After I see the code get set again, I will pull these, check continuity, and take them back to Autozone. I essentially got these for free with a giftcard someone had given me, so I'm not too broke up about it.</blockquote>