All OBD II vehicles use what type of read-only memory?

The correct choice, EEPROM, stands for Electrically Erasable Programmable Read-Only Memory. This type of memory is essential in OBD II (On-Board Diagnostics II) systems as it allows for storing diagnostic information and sensor data that can be updated when necessary.

EEPRON can be electrically erased and reprogrammed, which means it retains critical vehicle data even when the engine is turned off but can still be updated by the vehicle's control modules. This feature is crucial for accommodating software updates, changes in calibration, and saving diagnostic trouble codes (DTCs) without the need to physically remove the memory chip from the vehicle's electronic control unit (ECU).

In contrast, other types of read-only memory such as ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), and EPROM (Erasable Programmable Read-Only Memory) do not have the same flexibility. ROM is permanently programmed at the time of manufacture, making it inflexible for updates. PROM can be programmed once but cannot be erased afterward. EPROM can be erased using UV light, but it requires removal from the circuit and manual processes to reprogram. Thus, EEPROM's capability for easy electrical erasure and reprogramming