P0172 Buick -

Question

2001 Buick Lesabre Limited po172 code, engine light is on, change front heated o2 sensor and MAF and still check engine light is on, also used fuel cleaner about 100 miles ago and still po172 code pops up for over 4 weeks. PLEASE HELP, PLEASE.

Answer 1

HI there,

This code is for a rich fuel mixture on bank 1. This could be the result of bad spark plugs or a problem with one of the fuel injectors. It can also be caused by a bad rear O2 sensor after the converter.