The service bulletin for Nissan Maxima dated March 2004 mentions replacing an air/fuel sensor as a solution for the code P0171. 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....
P0171 - Nissan Type Powertrain - Fuel and Air Metering - ISO/SAE Controlled Description Fuel trim - Bank 1 - mixture too lean Cause Wiring, exhaust system, HO2S front, fuel system, injector, MAF sensor, ECMTry also: https://www.obd-codes.com/p0171...
So this engine code article applies to Toyota, Chevrolet, Ford, Nissan, Honda, GMC, Dodge, etc.Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has ...