It works in either the 'accessory' i.e. pre-ignition position or when the engine is running. You have to scroll through to the display you want e.g. ave mpg, press the button and keep it pressed until it resets to normal. Do this with each of the readouts in turn. Your trip meter in the central speedo will reset automatically as well.
Ahh thanks - that explains it! I was trying to reset while on the current speed display... didn't know you had to be in the relevant screen and reset them one at a time.
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