Control apparatus for vehicular electric component

A sensor control apparatus connected to a gas sensor includes a microcomputer containing a ROM (first storage section), and an EEPROM (second storage section) independently of the ROM. The ROM stores an anomaly diagnosis program containing at least one type of anomaly determination process. The EEPROM stores one or more flags set so as to represent whether the corresponding anomaly determination process is valid or invalid. The states of the one or more flags can be readily changed from an externally connected PC. A CPU executes a series of processing steps of the anomaly determination processes, and then obtains a determination result thereof when the CPU determines that the anomaly determination process is valid, with reference to the one or more flags.