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    cldavis68's Avatar
    cldavis68 Posts: 4, Reputation: 1
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    #1

    Feb 8, 2009, 03:08 PM
    Sys too lean (bank 1 & 2) what does this mean
    03 ford expedition, diagnostic code shows; sys too lean (bank 1) and (bank 2). What does this mean and how do I fix it?
    this8384's Avatar
    this8384 Posts: 4,564, Reputation: 485
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    #2

    Feb 9, 2009, 09:10 AM

    Since both banks are running lean, I would check for vacuum leaks first. Also check the EGR valve.
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