Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: PO171 is very similar to PO174, and your vehicle may show both codes at the same time. You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration. A code P0171 may mean that one or more of the following has happened: * The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled * There could be a vacuum leak downstream of the MAF sensor. Possible solutions include: * In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling * Inspect all vacuum and PCV hoses, replace if necessary * Check for a dirty fuel filter and proper fuel pressure
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...
You probably have a vacuum leak. Check under the hood for a disconnected vacuum hose.
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...
Trouble code P0171 means:System too lean (Bank 1)
its on the fuel rail, it actually takes temperature of the rail not fuel.
look for vacuum leaks downstream from the MAF. = p0171- Bank 1 (The passenger side) is lean-Change out your PVC valve on the valve cover on bank 1. Go to the dealership and buy it not AUTOZONE. Check this forum thread out: = http://www.ford-trucks.com/forums/426949-98-expedition-5-4l-p0171-and-p0174-solved.html = p0735-5th gear ratio incorrect = = p0181- Fuel temp sensor A circuit range performance = Can't really help you out with the others sorry...
Trouble code P0171 means: System Too Lean (Bank 1)
Trouble code P0171 means: System Too Lean (Bank 1)
Trouble code P0171 means: Fuel Trim System Lean (Bank 1
Trouble code P0171 means: System too lean (bank 1)
P0171 is system too lean, P1476 and P0440 are related to an evaporative system leak, and P1582 is idle adaptation at limit. You either have a leak in a vacuum hose or evaporative hose or a bad leak detection pump.
Trouble code P0171 means:System too lean (bank 1)