Codes without reader
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Autozone should be able to read your code for free. If yours is like my 2000, you can hold down the trip reset switch on the odometer then turn your key to on. Continue holding it until the "diagnostic" test comes up, mine is a sweep of the gauges. Then you can scroll through the different types of info (mph, rpm, fuel, bat,.....) you should, if you have codes, see P0xxx codes, these are the ones that you should be concerned about. Hope this helps a little.