Hello, I have a P0172 and a P0175, bank 1 and 2 rich..... what can that be? i changed the MAF sensor but I was told these cars, Lexus IS 250, 2010, 25k miles, don't like after market sensors. Is that so? the error codes came back. what can be affecting both banks? I don't think both oxy sensors can go bad at the same time.