fiftyfordfloored
Explorer Super Upper
- Joined
- January 27, 2007
- Messages
- 207
- Reaction score
- 5
- City, State
- Alpha, NJ
- Year, Model & Trim Level
- 2005 Explorer 4x4 Limited
Ok, I'm having weird problem... The truck runs and drives great, very smooth since I addressed the KOER 116 code by replacing the ECT sensor. However when I drive it on the highway now or for a somewhat long period of time "city" after a while the CEL comes on and remains on until I restart the truck. I checked the codes KOER and came up with:
136 - HEGO sensor circuit indicates system lean (left side)
173 - HEGO sensor circuit indicates system lean (right side)
How a single O2 sensor on the right side can come up with that idea, I don't know . Engine idles smoothly but it idle seeks from say 700 to 1000. I also have really bad mileage, dropped from the 15.4 I had before to maybe 12 or less... and my foot hasn't gotten any heavier. Both the idle seek and CEL/bad mileage all started at the same time. I found a vague mention of the FPR causing this in my search, but there is no fuel in the vacuum line or anything like that seems to be related.
So as of right now, I have the mileage of a truck with 35's on it, but without the benefit of actually having 35's! This is really starting to suck... Any ideas?
Thank you in advance!
136 - HEGO sensor circuit indicates system lean (left side)
173 - HEGO sensor circuit indicates system lean (right side)
How a single O2 sensor on the right side can come up with that idea, I don't know . Engine idles smoothly but it idle seeks from say 700 to 1000. I also have really bad mileage, dropped from the 15.4 I had before to maybe 12 or less... and my foot hasn't gotten any heavier. Both the idle seek and CEL/bad mileage all started at the same time. I found a vague mention of the FPR causing this in my search, but there is no fuel in the vacuum line or anything like that seems to be related.
So as of right now, I have the mileage of a truck with 35's on it, but without the benefit of actually having 35's! This is really starting to suck... Any ideas?
Thank you in advance!