What causes the p0171 code on a Ford TSB?
What causes the p0171 code on a Ford TSB? Another Ford TSB for a number of late 90-s Ford vehicles describes a problem with MAF sensor contamination where both codes, P0171 and P0174 would appear together. Problems with the mass air flow (MAF) sensor causing the code P0171 are fairly common in many vehicles. What does code p0171-system too lean mean? Code P0171 - System Too Lean: Symptoms, causes, common problems, diagnostic. The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too...