Trouble code P0171

[Tall Bald and Ugly]

That tells me the system is too lean on bank 1. Matching the code to the book number tells me fuel that fuel trim malfunction, air/fuel too lean. All well and good, but what does it mean? Do I- check injectors, sensors, what? Fuel delivery? Fuel pressure? Pump?

Any help would be appreciated.

[wtdash]

HI,

Usually we like to know year/(exact)model to help.

 

This POST ON NASIOC might get you started.

 

If your O2 sensors are old/original that's a common 1st step.

 

GL,

Td