Bad 02 sensor?
#1
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Bad 02 sensor?
So my truck has been being a turd lately and im getting like 9.8 mpg with the truck stock. On the highway i have to downshift into 4th sometimes 3rd to get up a hill going 70 even if its not that big. Im wondering if the could be the 02 sensor. I have a check engine light on and off but cant read it following the instructions on the forum. also if it is the 02 sensor do i need to replace the front and rear or just front 02 sensor?
#2
So my truck has been being a turd lately and im getting like 9.8 mpg with the truck stock. On the highway i have to downshift into 4th sometimes 3rd to get up a hill going 70 even if its not that big. Im wondering if the could be the 02 sensor. I have a check engine light on and off but cant read it following the instructions on the forum. also if it is the 02 sensor do i need to replace the front and rear or just front 02 sensor?
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its a 94 and i thought it only had one o2 sensor. when i went to autozone they asked if i wanted the one for before the cat or the one for after the cat which is wierd.
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well, i guess i'm not really sure. i know my truck isn't running like it should, and hasn't since i got it about a year ago. i haven't concentrated on the engine yet, i really need to. it idles like crap, probably doesn't have the power it should...but the gas mileage isn't too bad, by the sound of it.