Is it just coincidence that EVERY single thing I read about Oxygen Sensors online indicate that when they fail or become faulty, they will always produce a voltage that is too low, and therefore cause an engine to run Rich?
Has it never happened where a bad O2 Sensor caused a Fuel Injected engine to run LEAN, and not RICH!!?? Is this so far fetched or something? Can't a failing O2 Sensor ever cause false readings towards the higher side of the .45 voltage median?
My sisters car has had a problem for a long time now where it "feels" and drives like an engine running LEAN, but the O2 Sensor is always indicating RICH about 70% of the time, causing very low Injector on-times etc. Sure it's good for her gas-mileage, but not much else.
Anyone have some input for me?
THANKS!:)