A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive. A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transv...
Brands of vehicles affected include but are not limited to Ford, Lexus, Chevy, BMW, Toyota, Jaguar, Acura, Volvo, Nissan, etc. Although generic, the specific repair steps may vary depending on make/model/engine. Anecdotally this code seems more common in Ford & Chevy vehicles....