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A good read is any reputable explanation of what an OBD-II tester does, what the codes mean, and the fact that it is showing a system OR systems that can cause the triggered code(s). Further diagnosis usually narrows down what part is misbehaving BUT (just as an example) a DTC for an oxygen sensor doesn't mean the sensor is bad. It means for some reason the values are as defined for that DTC and system. Your task is to determine if it is in fact a bad sensor, or the myriad of other things associated with why the sensor is showing what it's DTC indicates. Newer cars (with all them damn computers) can show a lot more information on a newer OBD-II reader, quite possibly exactly what component failed and why. Many backyard mechanics (and I use that term loosely) just throw parts at it (called shotgun diagnosis) because they have neither the tools or time to delve into why a DTC is coming up or returning. This usually results in a huge repair bill by throwing parts at it until it behaves (sound familiar, stealership mechanics may be guilty of this). Good luck!


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