When the service engine light comes on, it does not necessarily mean that the O2 sensor is out. Alot of these diagnostic lazy mechanic machines will automaticallly tell you that this is the fault. What is your vehicle doing out of the ordinary? service engine light can be coming on for many reasons. Is there a knock on the engine? Is it lacking radiator fluid? does it need oil? or does it need a tune up? let me know.
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