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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2002 Ford Explorer Question: PO 171 CHANGE O2 UPSTREAM AND CHANGE THE MAF SENCER CHECKED VACUUM LINES
Answer #1mastertech6371 October 31, 2011, 16:05Master
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.
ReplyNATHAN6969, October 31, 2011, 18:39Rookie
Thank you Roy.
Replymastertech6371, October 31, 2011, 18:59Master
ReplyNATHAN6969, November 01, 2011, 16:06Rookie
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.......
Replymastertech6371, November 01, 2011, 16:07Master
thanks, glad to help