Did I leaves something disconnected?

[Oldmactech]

My 3.0 won’t complete the OBDii diagnostic cycle to pass emissions in GA. It completes 7 of 8 cycles but after nearly 400 miles, numerous starts, all types of driving I still get the catalyst monitor incomplete but no codes. Last month a got a bank one before catalyst check engine error but I cleared it and reset the adaptations.

As a senior I am exempt from exemptions but if I tried to sell it would need to pass.

This car had a shade tree head gasket done 1200 miles ago, is it possible I left something disconnected or have one of the O2’s reversed in their places causing it not to complete the diagnostic cycle?

Thanks.


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