After finally fixing most of the codes on my car by replacing the HPFP, there are still two lingering ones. P0236 which is a turbo charger boost sensor circuit performance code and P013E which is an 02 sensor code delay response to rich lean bank 1 sensor 2. No significant performance issues currently aside from a small surge in power every so often.

My question is what might cause this? I've boost leak tested my car and done every possible, imaginable thing to fix any air/fuel metering issues, including changing my MAF, replacing the HPFP, changing and gapping plugs, replacing ignition coils, replacing the purge valve sensor, boost testing... And the codes are still there. I notice what seems to be a slight misfire at idle, but it is very small. Wiring issue? Exhaust leak? Tune?