I went thru the P1128 & P1130 issue last year.
http://986forum.com/forums/boxster-general-discussions/72288-p1128-p1130-running-fine-turned-into-barely-running-engine.html
A new MAF solved my problems. It seems like for many people on the forum a new MAF solves their problems. It is an easy to change part, but not the cheapest. With your code only being on one cylinder bank it may or may not be the culprit.
If your Autel can read real time fuel trims you often see if you have vacuum leak without having to smoke test the engine. Search online for how to interpret long term and short term fuel trims.
Can your Autel read O2 sensor voltage? Another thing to check before changing parts.
I learned the hard way that having real time data helps so much to make an informed decision.
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