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Originally Posted by SouthArk370Z Those are post-cat codes. IIRC, post-cat O2 sensors are not used for engine management - they are to check operation of cats. Shouldn't cause any problems
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05-04-2017, 07:36 AM
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05-04-2017, 08:16 AM
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If nobody comes up with an answer soon, I'd hit the FSM. A re-tune with a bit richer mixture might fix the problem. Keep in mind that after you get things fixed you will have to go through several drive cycles (details in FSM) before the emissions system will report being ready.
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