P0172 Pontiac - 2001

Question

Replaced bank one sensor two because of code I had, put in fuel injection cleaner drove over 100 miles all was good. Parked car started it next morning to go to work and now got code P0172, car never had that code before could that sensor go bad just like that,, or could the cleaner of done something? Mas air flow sensor only couple months old, as is the tps, and is other sensors ,, any suggestions on what it is please. ..

Answer 1

Its possible one or more fuel injector is not working correct or dumping too much fuel.

With a special OBD-II scanner you can use to do a fuel injector balance test, that would make things a lot easier and less things to guess.