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The term EEPROM stands for Electrically Erasable and Programmable Read Only Memory.

That's mouthful but it mean that an eeprom is a device(integrated circuit) that can be erased and reprogrammed to set certain parameters for it's specific use. IN an automobile, there are several EEPROMs located in the various control modules used to operate the engine and other parts of the vehicle. Because there are variables (type of gasoline, temperatures,humidity,etc, the EEPROMs are constantly being reprogrammed and updated by the main sensors in the vehicle.

There is one MAIN EEPROM in the Engine Control Module (ECM). That particular EEPROM is only reprogrammable by the dealer> Some vehicles allow for replacement of the EEPROM that gives different performance to certain engines.

A tech manual for the specific model of vehicle will have that information. That would be a service manual from the manufacturer not an aftermarket manual.

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