Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1) Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)
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)
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...
p0171 andpo174 mean that you're car is running lean
Get a can of mass air flow sensor cleaner and clean the maf sensor
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
Lean condition detected on banks 1 & 2 (left and right sides). Most commonly a dirty mass air flow sensor, or possible vacuum leak.
Trouble code P0171 means: System Too Lean (Bank 1)
P0171-system too lean bank 1 and P0174-system too lean bank 2
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.
P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.
The 1995 Windstar uses the current ODB-II diagnostics scanner and codes.See "Related Questions" below for more about reading and responding to trouble codes.