2002 Ford Windstar Minivan DTC P0171 "System too lean"?? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 2 (permalink) Old 05-07-05, 12:41 PM Thread Starter
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2002 Ford Windstar Minivan DTC P0171 "System too lean"??

Hi, I pulled up this code P0171 because my check engine light is on.

Can somebody tell me how to start trouble shooting the problem??

Here's what I looked up so far:

P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously
monitors fuel delivery hardware. The test fails when the adaptive fuel
tables reach a rich calibrated limit. For lean and rich DTCs:
Fuel system
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.
EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.
Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.
A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value
between -35% to +35% is acceptable. Reading beyond these values indicate a

Perhaps I need a trouble shooting flow chart!?? I have a 2002 Ford technical publication but I can't find any flow charts on it.
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post #2 of 2 (permalink) Old 05-08-05, 03:46 AM
Two SC 61's = trouble
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Re: 2002 Ford Windstar Minivan DTC P0171 "System too lean"??

I guess that being on one side its either inlet leak, exhaust leak, or hego senser is suspect???....Have you checked spark plugs to see if this is actually happening ???Spray some WD40 around injectors to check for leaky O rings...

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