CEL codes P1128 & P1130

[speedyspaghetti]

Hey all -

So about a week ago codes P1128 and P1130 popped up on my car. I did some research and found that a dirty throttle body / MAF might be the issue. I got to the engine and cleaned the TB (didn't do the MAF because I realized I didn't have a security torx bit), reset the computer by disconnecting the battery, and was good to go.

Drove the car for another week and today the CEL came back - same codes. Obviously, the MAF might be an issue to look at, but what else should I be looking for? I tried taking the oil cap off while idling and it was really difficult - I could eventually lift it a bit and get a vacuum "hiss" but I cannot physically take the cap off with the engine running. Is this indicative of an issue? AOS?

Thanks for any help...