Right first things first I'm a newbie here but I'm on many other forums as I restore retro cars. Right 4 week ago my mazda had a noisy bottom end turned out to be the injector seal that had gone and caused the diesel in number 4 cylinder to seep past the piston rings and wash away the oil on the crank so £1320 later I got it back from the garage. Then realized the code had been wiped from the stereo as well as the windows not working from the drivers door switch. The windows just needed resetting by putting all windows to the bottom them back up and holding the switch for a further 2/3 seconds. The stereo was a bit more complex but from reading a how too on here I fixed it using the 3511 code