engine codes

2000 FORD EXPLORER
170,000 MILES
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PAPA1HUNDRED
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Can you Tell me what do these engine codes mean

P0171
P0174
Jan 22, 2016 at 7:55 AM
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WRENCHTECH
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They mean the fuel system is too lean and the computer has reached it's adaptive limits and can no longer compensate for it.

On a Ford, 90% or the time this is caused by a bad vacuum leak at one of the large rubber hoses or connectors.
You can perform a smoke test to locate it if it's not obvious.
Jan 22, 2016 at 8:33 AM
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PAPA1HUNDRED
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Wow thanks for responding so quickly,amazing, is a smoke test something I can do myself or do I have to take into a shop. THANKS. AGAIN
Jan 22, 2016 at 8:52 AM
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WRENCHTECH
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The smoke machine costs about $1000 so I doubt you have one. You probably need to have someone do it for you.
Jan 22, 2016 at 8:54 AM
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PAPA1HUNDRED
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Sure thing thanks again for your help.
Jan 22, 2016 at 8:59 AM