Ford6.8l Engine Service Light On

Oxygen sensors essentially check to make sure the ratio of fuel to air is correct. When there is too much fuel or too much oxygen going into the engine, the use of this sensor can allow your car's computer to equalize the issue. Oxygen sensors fail somewhat frequently, this is why it is the most common reason for your check engine light to go on. The reason your sensor might fail is because you've neglected taking care of your car or from using gas that is high in ethanol. Besides the obvious reasons that your engine not receiving the correct ratio might be a problem, one of the most serious ramifications of a sensor failure is losing almost half your car's fuel efficiency (which costs money by itself).

Catalytic converters ain't cheap. Having to replace a converter is one of those things you're hoping is not the case when that check engine light comes on. The converter is part of your exhaust system and turns toxic gases into mostly harmless exhaust. Bad exhaust valves, bad spark plugs, and anything that causes the exhaust gases to be the wrong temperature or consistency can make a converter fail. Not only does it cost a lot to replace converters, there's probably another underlying problem that caused it to fail, which will cost more money to fix. You should hope, just hope, that this is NOT the problem. However, don't let the fear of your converter being the problem stop you from getting your car checked out. Your car could start releasing toxic fumes all over the place.

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