Troubleshooter's Forum
P0172 bank 1 running rich.
Injectors, coils, fuel pump, IAC valve, TPS, coolant temp sensor, all 4 02 sensors, cats etc. all replaced. Has high fuel pressure; (spec is 49 +/-2) at 60 PSI and needle bounces around. Replaced fuel pump twice thinking the regulator was failed. Tried to buy the OEM...