I think I know the problem but...
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I think I know the problem but...
Well, I think I know the problem but I want you all to confirm for me just in case. Today on the drive home from Santa Barbara to Sacramento, an hour from home, my check engine light came on. I have 56,600 miles on the truck and it has the 5.7L Hemi. After the CEL came on tonight, my mileage dropped about 2-4 mpg. I think it may be the O2 sensor. What do you all think? I am going to go to Auto Zone tomorrow and have then scan it and see what the code is (to late on a Sunday night). I was gonna pull the one fuse (I think its 26?) to reset the PCM but after I noticed the decrease mileage, I figured it wouldnt help anyway. Anyone think they have an idea?
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Sometimes it will sometimes it wont. Many times its just a gas cap that sets it off (if you had recently gotten gas)... Whenever the CEL Is set, try to get to a parts store or the closest gas station with a mechanic to see what the light is before shutting the truck off. (Some mechanics will be nice and do it for free, some will charge 20-100$ so dont spend too much when advance does it for free).
Bad gas mileage can be caused by many different things... an o2 sensor is definately one of them but usually if its bad the light will stay set.
Bad gas mileage can be caused by many different things... an o2 sensor is definately one of them but usually if its bad the light will stay set.
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