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2002 Ford Explorer Question: PO 171 CHANGE O2 UPSTREAM AND CHANGE THE MAF SENCER CHECKED VACUUM LINES

 

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NATHAN6969, 4.0L V6, Tacoma, WA, October 31, 2011, 15:55
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EXPLORER RUN GOOD MAYBE GAS CAP, OR RE CHECK VACUUM LINES,SHOULD I CHANGE THE DOWN STREAM O2 SENCER, PLEASE HELP

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  • Answer #1

    October 31, 2011, 16:05
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     Master

    171 is bank 1 vacuum leak. it is not the o2, that is the last thing. it could be and most likely is a vacuum leak on that bank at the upper intake.
    other possibilities is the pcv, low fuel pressure or a mass air flow sensor.

    Roy

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    NATHAN6969, October 31, 2011, 18:39
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    Thank you Roy.

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    mastertech6371, October 31, 2011, 18:59
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     Master

    good luck

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    NATHAN6969, November 01, 2011, 16:06
     Rookie

    Roy,you are good. fund a damage hose elbow type under my throttle body....thanks again for your help. Nathan6969 from Seattle wa. I wish you a good life.......

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    mastertech6371, November 01, 2011, 16:07
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     Master

    thanks, glad to help

    Roy

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