WtF popped on once again lol, was about to replace my 02 sensor again till I did a search and realized its the same code that's pops up periodically, guess ill just shut it off and hope for the best.

 

Swapped out the 02 sensor... Came back on in 20 miles, guessing I might have air coming in through the plenum or something stupid going on.

 

Im throwing this sand code. Checked for plenum issues and noticed missing bolts from the outer side not the six middle ones. You mentioned air leak thru there can that be it with mine? I still need to check the headers as they’re aftermarket and my exhaust is broken off at the y pipe. Car was sitting for a year just now started moving it more consistently and threw that code. Hope someone can help us