check engine light on on 1999 Ford F-150

code p171 bank 1 too lean. what should i do to fix it?

by in Hewitt, TX on February 26, 2012
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1 answer
ANSWER by , February 26, 2012
The 2 things i would do first is have someone check for vacuum leaks with a smoke machine. And also have the MAP sensor cleaned. Reset the engine light and test drive it. Sometime a collapsed vacuum hose will not show up with a smoke machine because the smoke pushes pressure in the hose. Have someone check all hose with a good bright flash or drop light.