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Erratic idle: sets code p0171: replaced/repaired every symptom for code p0171. Still erratic idle @ op temp. Major problem: code will not go away. Also, possible slight miss at tail pipe during periods when idling smooth. Help!
Vehicle: 1998, ford, windstar, 3.8
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1 Answer

Hi there

A bad seal on the gas cap will usually set a p0455 code for an evap leak.

The P0171 code can be the result of a bad O2 sensor and several other items. I have also seen it happen due to a weak fuel injector as well.
answered by (8k points)

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