I just took my Ranger 4.0L to get the oil changed. As I was leaving the dealership the check engine light came on. The codes said Bank 1 and Bank 2 -- system too lean.

Can anyone help me on this issue, have all the o2 sensors went bad, or is something else going on?

 

Check out this first before you buy anything like 02 sensor's

Vaccum leak.
https://www.ranger-forums.com/forum2...ad.php?t=63031

 

Thanks! I'll check that out.

 

Sorry I haven't posted anything back lately. I changed the hose that was mentioned and that took care of all my problems.

Once again, thanks!

 

Happy i could help and it was a easy fix!