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Old 12-09-2002, 08:28   #1 (permalink)
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99 Windstar - Error code PO 171

I have a stored code from my Windstar and I am curious what it is and how to correct it. The error code states: The fuel system for Bank one was too lean - 171. Any suggestions?
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Old 08-20-2003, 08:34   #2 (permalink)
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It could be 1538 also, This error code says that the intake manifold runner controll is stuck open. May be the link is broke or cable being disconnected.
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Old 10-12-2003, 10:30   #3 (permalink)
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Re: 99 Windstar - Error code PO 171

What are the possible causes?
- intake air leaks (If you are idling fine then I would discount this one.)

- front oxygen sensor (check harness and connectors for breaks/dirt/etc. It is not very likely that it is oxygen sensor that is problematic unless you are logging other codes as well)
- injectors
- exhaust gas leak (Check for the sound of your exhuast. No exhaust noise would indicate a proble,...obviously)
- incorrect fuel pressure (If Acceleration and cruise performance are normal then disregard)
- fuel starvation (If Performance is normal disregard)
- mass air flow sensor

Code P0171 is triggered by either:
Fuel injection system not operating properly, or air/fuel mixture ratio compenstation faulty actual mixture ratio is too lean
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Old 10-12-2003, 10:36   #4 (permalink)
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Re: 99 Windstar - Error code PO 171

Code P1538 is Intake manifold runner control stuck open.

This can be caused by IMRC vacuum being bad or there is a vacuum leak. This could also mean that the IMRC valve is sticking. Most likely due to carbon build up.
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