2002 Ford Explorer Q&A

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

EXPLORER RUN GOOD MAYBE GAS CAP, OR RE CHECK VACUUM LINES,SHOULD I CHANGE THE DOWN STREAM O2 SENCER, PLEASE HELP -
Answer 1
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 -
Comment 1
Thank you Roy. -
Comment 2
good luck -
Comment 3
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....... -
Comment 4
thanks, glad to help Roy -