A self-regulating gas generator that, in response to gas demand, supplies and automatically adjusts the amount of gas catalytically generated in a chemical supply chamber from an appropriate chemical supply, such as a chemical solution, gas dissolved in liquid, or mixture. The device may cache the media manager application upgrade in a cache memory and notify a user of the device that the media manager application upgrade is ready for installation. The permanent magnets are magnetized in the direction of the line, adjacent permanent magnets having an opposite direction of magnetization. The second application circuit is used for receiving and processing second data to output second processed data. The method includes adjusting engine operation responsive to exhaust gas sensor degradation, the degradation identified during deceleration fuel shut-off and compensated based on whether vapor purge operation is occurring in the engine during DFSO.