2000 explorer with code PO171

System too lean, bank 1 . engine runs ok ,any ideas guys..........

System too lean, bank 1 . engine runs ok ,any ideas guys..........

Engine and tranny and mileage helps on this end.

But, engine too lean is often a vacuum leak. Check the vacuum / pcv hoses and see if you can find a problem. Check her over good and if that doesn't fix it, post again for more help.

Engine and tranny and mileage helps on this end.

But, engine too lean is often a vacuum leak. Check the vacuum / pcv hoses and see if you can find a problem. Check her over good and if that doesn't fix it, post again for more help.


checked for vaccum leaks , found none, i than erased check engine light drove tested for a while it did not come back on .I'm going to put some injector cleaner and hopefully it doesn't come on again. Thanks for your time and help exploded 99!

checked for vaccum leaks , found none, i than erased check engine light drove tested for a while it did not come back on .I'm going to put some injector cleaner and hopefully it doesn't come on again. Thanks for your time and help exploded 99!

Well, didn't turn out to be much help!

If you are feeling motivated, google for cleaning your maf and try that as well. I think the injector cleaner is a good idea.