The service engine light came on my Ford Windstar 1999. The mechanic checked it on his computer and came up with a Code PO 171.
I changed the oil and filter and now the light has gone off, but I want to find out what that code stands for. Would the oil change and filter make that much difference. It does not chug-chug and it has power again.
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Code 171 is fuel system too lean bank one, and 174 is the same for bank two. Usually a vac leak or low fuel pressure.
Code 128 is for the engine not reaching normal operating temp. Usually a thermostat problem.
Google your codes & then diagnose the system & items related to the codes
Type: OBD Code PO 171 --or whatever the codes are
If you have Oxygen Sensor Codes, it is most likely the upstream sensors have failed, because you did not know they get replaced as preventative maintenance at 100,000 or when they fail, if that is how you take car of your vehicles
171 is the 1st bank running lean. If you have the 3.8 motor, I am pretty sure it is the beginning of the leaks that cause the 174 code (other side) gaskets and seals to fail. Ford has never been able to make the 3.8 motor work! The good news is they are aware of it and have a service bulletin out on it. It probably will cost between 6-8 hundred, again assuming you have the 3.8 Save your receipt, maybe one day Ford will own up to their mistakes on the 3.8 and if they do a recall they will reimburse you.
po 174 is typically accompanied by code po 171 however the code is normally a vaccum leak fords normally have an issue with the pcv valve hose collapsing a busting or either the plastic intakes have a vaccum leak that clears up when the engine warms up which is normally the upper plenum gaskets
ford has a technical service bullitin out on this vehicle for the intake gaskets leaking causing a vacum leak that set codes 171 174. the solution is to have the intake manifold gaskets replaced . call your local ford dealer and see what thay can tell you about this bullitin.