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If this light comes on, it’s time to plug into the ALDL port for a check up. If you don’t have access to a Diacom unit, place a jumper such as a paper clip between the upper right two terminals. You can also buy a cheap code scanner at an auto parts store that does the same thing. This will flash the “check engine” light in respect to the code it’s giving. For example, a code 12 will flash once, pause, and then flash twice. While this is helpful, it will not give you anywhere near the data the Diacom provides. View Related Article
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