Ive been having this cel p2187, i have smoke tested for boost and vacuum leaks, none, the afr is very normal at idle and wot. Sometimes it would be frozen at 14.7 so i thought upstream 02 would be the issue, ive replaced MAF, upstream and downstream 02. Since replacing upstream 02 the afr doesnt freeze anymore but same code, is it possible that if i had a bad sensor when it was tuned i would need a retune to fix it?

 

Possibly. Honestly my car has a mystery tune on it (previous owner 6 yrs ago). Everytime I got that code it was the downstream 02 but you already replaced that. Maybe try a hard reset on the ecu. Disconnect the battery for a while. At Acura we hold the cable ends together to drain any capacitors in the ecu and it doesn't cause an issue. Im not sure about these cars. Also another thing is maybe the map sensor could be going out. Replaced that as well on mine

 

I have this same CEL in my LNF Solstice. I replaced both fuel pumps and checked for exhaust leaks and still get the code. Maybe I should replace the 02 sensors next. I also read that the emissions purge valve causes the code