2005 Ford Focus ZX4 - Code P0171

Specific repair issues for Ford cars & FWD vans
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805auto
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2005 Ford Focus ZX4 - Code P0171

Post by 805auto »

Po171, no vacuum leaks, o2 check ok, baro ok, fuel pressure at 30 psi, pcv system ok, any more ideas?
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brianp87
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Re: 2005 focus ZX4

Post by brianp87 »

What are the fuel trims?
Tim Martin
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Re: 2005 Ford Focus ZX4 - Code P0171

Post by Tim Martin »

Beings it is a Ford, my firs thought would be a Mass Air Flow Sensor out a range. They can be faulty and not set a code.
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steven kiser
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Re: 2005 Ford Focus ZX4 - Code P0171

Post by steven kiser »

since this can be caused by a leak in the crank case look for a bad dip stick as well as a p.c.v. issue. this code has a long list of reasons to trip. you said that the fuel pressure was 30 psi. my specifications call for a minnimum of 35. before i'd replace the pump i'd check the regulator, i'm seeing this mentioned a few times here.
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Re: 2005 Ford Focus ZX4 - Code P0171

Post by Goose »

Believe it or not I have seen worn plugs cause this code.
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