Service engine light came on. Code 171 and 174, Replaced the MAF and the air filter, Light came back on. What could the problem?
This should take some of the guess work out
http://www.aa1car.com/library/ford_lean_codes.htm
SOURCE: codes #171 & 174
first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2)
SOURCE: codes 171 and 174 2001 ford winstar
dont take soo much in consideration after you have make all this things, some time is on only for any wire faulty, or a shrt electrical arc in any place in wire system. ask auto tap mechsnics for this maybe they have similar case before.
SOURCE: check engine light on computer codes 171 174
switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.
SOURCE: shake rattle then roll. rough idle last few weeks
The intake manifold gaskets are the most likely cause of your problem. Have the fuel pressure tested also.
SOURCE: 2003 Silverado throws a mass air flow code and
There is a code lean,present,have the fuel pressure tested,see if it is the fuel pump,and also,check the air cleaner (air filter),and have the exhaust checked for a restriction,
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