[Shadow6]

Yeah, I agree. I have a really hard time imagining it’s actually the valves—plus the threads dealing with the P219A/P119F/valve issue reference a Subaru and/or Toyota TSB that was specifically for low mile 2017+ cars, and I have a higher mileage 2014.

An update: a new downstream O2 sensor (Denso) I installed this morning does not seem to have fixed the code—I have P219A pending after a short test drive—but I swear the slightly rough idle and tendency to want to stall when coasting to a stop is gone.

I will take a look at what you suggested on the temps (and back pressure on either side of the front catalytic converter) and report back. I will say I haven’t done autocross in the car since covid, but it’s doesn’t feel down on power.

I’ve put an email in to OpenFlash Performance, I might try flashing it back to has to see if that changes anything. I’ve had issues with bad E85 throwing codes before, maybe all my local E85 is “bad” now.


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