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There is no code 12. 12 is a delimiter intended to show where code sequence starts and ends.
The H is a stored "History" code. The 64 is a right bank o2 sensor circuit code.
Since it's a history code you should clear it by disconnecting the - post at battery for a minute to clear the codes. Then run the car and see if it throws them again.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.