Possible causes
– Intake air leaks
– Faulty front heated oxygen sensor
– Ignition misfiring
– Faulty fuel injectors
– Exhaust gas leaks
– Incorrect fuel pressure
– Lack of fuel
– Faulty Mass Air Flow (MAF) sensor
– Incorrect Positive Crankcase Ventilation (PCV) hose connection
– Faulty front heated oxygen sensor
– Ignition misfiring
– Faulty fuel injectors
– Exhaust gas leaks
– Incorrect fuel pressure
– Lack of fuel
– Faulty Mass Air Flow (MAF) sensor
– Incorrect Positive Crankcase Ventilation (PCV) hose connection
Tech description
The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.
It’s a very common problem for the Ford Windstar. Here a link to a web site with information how to repair:
1999-2003 Fords Windstar Code P0174
When is the obd code mean?
– Fuel injection system does not operate properly.
– The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
– The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Excessive Fuel Consumption
– Excessive Fuel Consumption
P0174 FORD OBD Code Description