p0172 code, is this a sensor problem as I replace one but not the others?

Question

I have a 1998 gmc suburban with the service engine soon. Upon checking the code, I have a P0172. I've replace one of the sensors and the code went away for months. It then return. Should I replace the other sensors?

Answer 1

Hi there

It is possible there is a problem with the front O2 sensor, the code means there is a rich fuel mix on bank 1. This can also be the result of a problem with a leaking fuel injector.