I think after this it's going to finally make me get a replacement ECU on ebay.. It's like every time I reset it I get some bogus code (knock sensor or mis-fire 3-4) and reset again and I can go like a year without seeing any other codes..
Oddly in this video at the time the knock sensor code kept coming right back after I cleared it, but the sound stopped and I went for a drive and I cleared the code again and the knock sensor code went away for good.
Hmm perhaps piston slap? Maybe I never heard it before because the timing was off by 1 tooth and 2 teeth on the drivers side, so the combustion chamber pressures are higher now?