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PO 171 CHANGE O2 UPSTREAM AND CHANGE THE MAF SENCER CHECKED VACUUM LINES

(2002 Ford Explorer)
in Tacoma, WA on October 31, 2011
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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Popular Answer
on October 31, 2011
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
on October 31, 2011
Thank you Roy.
on October 31, 2011
on November 01, 2011
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.......
on November 01, 2011
thanks, glad to help

Roy
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