Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1) Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)
These 2 codes are common indicators of a well-known failure on the 1999-2003 Windstars. Be sure to review the additional information in the "Related Questions" below...
Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1) Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)
p0171 andpo174 mean that you're car is running lean
Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)
Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)
I'm not exactly sure about the 136 and 141 codes, but the 171 and 174 are symptomatic of a known problem with Windstar 3.8 litre engines. Those codes combined with rough idle are prime indicators of a leaking upper intake manifold involving worn out "isolator bolts". See "Related Questions" below for more
P0171-system too lean bank 1 and P0174-system too lean bank 2
Read through the "Related Question" that discusses a common problem with the Windstars and rough idle - check engine codes P0171 & P0174. That might be part of your problem too...
P0171 - system too lean ( Bank 1 ) - passenger side of engine P0174 - system too lean ( Bank 2 ) - drivers side of engine
It means your vehicle is running lean you will need to replace the intake manifold gasket, as it is plastic and the seal wears out.
Get a can of mass air flow sensor cleaner and clean the maf sensor
P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.
its on the fuel rail, it actually takes temperature of the rail not fuel.