Codes P0171 and P0174 indicate that the engine is running lean on both the bank 1 and bank 2 sides, respectively. Common causes include a vacuum leak, such as a cracked or disconnected hose, a dirty or failing mass air flow (MAF) sensor, or issues with the fuel system, such as a clogged fuel filter or weak fuel pump. Additionally, problems with the oxygen sensors can also lead to these codes. It's important to diagnose the specific cause to ensure proper repairs are made.
Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2) Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1)
p0171 andpo174 mean that you're car is running lean
Probably a vacuum leak. Do you have a code P0171 or P0174?
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 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)
lean bank 1 lean bank 2 fuel trim limits reached
Trouble code P0174 means: System Too 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...
broken MAF sensor, easy fix... it's on the intake right after air filter... second option is that the engine gets false air through broken hose...
You probably have a vacuum leak. Check under the hood for a disconnected vacuum hose.