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Originally Posted by DuhSoDeadly
So I ordered an OBD2 scanner and checked for codes, currently not showing any codes but I did have the battery disconnected on multiple occasions since it hasn't been running. With that being said: Would I still be able to see codes when scanning, or are they going to be temporarily cleared until the car is running for a bit? If it is the case that my car did store a code, but disconnecting the battery has cleared it, is it possible to retrieve that code or have it reappear in a vehicle that won't start?
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If you previously disconnected the battery, you probably erased any stored or pending codes. This is why we tell people to never try and clear codes by disconnecting the battery, you lose all the diagnostic data that was stored in the DME and have no idea where to begin...........