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Originally Posted by JFP in PA
Sorry, but that is bad advice. Without reading the codes, he is going to be chasing his tail, with the codes he has some hope of finding out what is going on...........
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If your engine caught fire and melted a bunch of sensors, thus throwing a dozen CELs, would you rush over to autozone to have your codes read? Instead you can simply read the flames coming from you engine. Likewise it would be far more telling to look for water in his cylinders before reading random OBD codes. There is no code for failed water jacket, in case you did not know
If he reads a dozen related codes, he will end up chasing the chupacabra and possibly ignoring the more obvious and definitive symptoms I mentioned before.
The OBD system is meant as a supplement to automotive diagnosis and should not be used as a replacement for standard mechanical engineering experience.