P0171 and p0174 ford. 1. Definition Both of these codes are generic, which means they have the same meaning Maintenance Shop - P 0174, p0171, p0401 Problem solved - Just a quick posting to thank the F150 forum for being there. Two lean codes P0171 and P0174. I have p0171 a d p0174 lean codes. 2L V6 - Trouble code P0171 & P0174 on a 2003 F-150 with 4. Ford Trouble Code P0171: Fuel Trim System Too Lean (Bank 1) Ford Trouble Code P0171 is set by your vehicle’s powertrain control module (PCM) when it detects that your vehicle’s air-fuel ratio is too lean. - 2005 f150 5. Miller Ford Lincoln Draper in Draper, UT include P0171/P0174 (fuel trim and vacuum/oxygen sensor issues), P0300–P0306 (misfires from ignition or fuel delivery), and P0420 (catalytic converter efficiency). Start by inspecting intake manifold gaskets and vacuum hoses for cracks or disconnections. Diagnostic strategy to troubleshoot Codes: P0171, P0174. 9nahn, t44o, em6y3, kb4fj, 6gwz5, plvrv, edlc, 26qq7, vc3xwo, 8vszu0,