Originally Posted by rocconi
My guess is either the front O2 sensor or a bad fuel injector. How is the engine power? If one injector is not putting out the correct amount of fuel the computer adjusts the other 3 injectors to keep the average correct. This can kill fuel mileage. See if the long term fuel trim is out of range.
The vehicle runs like a beauty. No acceleration problems. Engine power is awesome.
How do I check if the long term if long term fuel trim is out of range?
Can the front o2 sensor be faulty even though the engine check light is not on?