Having problems with your 1999 Ford Windstar ?
I have p0171 and p0174 codes for the last month. have replace the IAC valve, cleaned the MAF and added fuel system cleaner. Want to know what to replace next for the 1999 windstar with a 3.8 engine.
If I remember right from every code reader I have looked at P0171 and P0174 are oxygen sensors. Start there and see where it takes you. If after replacing those, the codes come back something else is causing them to read lean or rich. Also, could have been a one time thing and the code could be stuck in your computer, to get rid of it remove both battery cables and hold them together metal to metal for about 10 seconds. Then reattach them the light on the dash should be gone, but might come back shortly.
Repair Help & Product Troubleshooting for 1999 Ford Windstar
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