Last time I checked my codes it spit out O2 sensor problems. I haven't gotten the greatest of milage either. They are the sensors that came from the factory with the car in 88. I knew I probably needed them, but never really thought about it. I bought all of this other bullsh!t and I should have worried about a properly running engine.
How much of a gain in mpg's did you see? How about power wise did it make the car accelerate smoother or just make the engine run better overall?
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