[Dustin88]

I have pulled the codes on my mustang, and need help finding out how to fix the problem.

It is the 2.3l with auto transmission and A/C.

First off, the check engine light has been coming on for the last few days. Staying on for about 5 minutes. And every now and then the car will idle real slow with it in gear but stopped. I had the A/C off when that happened.

The Hard Fault code is 111 I know that means "System checks OK" So I know that's not a problem.

But the memory codes are:
172 "Heated oxygen sensor indicates lean condition, right side"
and
186 "Injector Pulse-width higher than expected"

Does anybody know what to do to fix the problem?

[turboeeyore]

if the o2 sensor is reading lean, it's telling the computer it needs more fuel, so it opens the injectors to compensate, could be a clogged fuel filter.