My daughter’s 2011 Subaru Forester has popped up a P0137 code - low voltage to o2 sensor number 2.
It also sounds like there’s a significant vacuum leak when the trorttle is pressed, right under the plastic air intake box that connects to the intake manifold.
It hesitates on acceleration and rough idle, often kills when not giving it little gas at intersections. Then, I need to press down the gas pedal in order for it to start.
She just bought the car. It runs good on the highway and while driving. Has difficulty down shifting when going up hills.
What to do, what to do?