Softballdad
Member
- Joined
- July 16, 2012
- Messages
- 42
- Reaction score
- 3
- City, State
- Sandy, OR
- Year, Model & Trim Level
- 2000 Explorer
So, my 2000 Explorer threw a PO171 OBD code about a year ago. System too lean-Bank 1. After researching this I'm leaning towards it being the O2 sensors. I've already checked the MAF and haven't found any other vacuum leaks. I have hesitation while going up hills and long slow climbs and my gas mileage sucks. This seems to be worse the hotter it is outside because it doesn't seem to happen in the fall and winter. ( Hot air is less dense than cold air? So the air/fuel ratio is different? ) My CEL comes on for a few days and then will go off for weeks it a time. If one or more of the O2 sensors were bad wouldn't that code always be happening? And the hesitation is always there, even on the flat roads. There is no trouble starting it or at idle. Everything feels fine. If it were something other than O2 sensors, like a fuel pressure issue, I would have major problems bigger than hesitation, correct? The thing that doesn't make any sense is that whatever the problem actually IS, it's not throwing the code all the time. Just two days ago I put fuel injector cleaner in, and today is probably the coolest day in at least a month and Bam!, my CEL comes on. What the ? Anyone have a similar problem or advice?
I've been driving it like this for a year (terrible and lazy, I know), and again, whatever the problem is, it hasn't gotten any worse.
I've been driving it like this for a year (terrible and lazy, I know), and again, whatever the problem is, it hasn't gotten any worse.