Flashing glowplug light on 1.9 tdi vag models including sharan, commonly caused by a dicky brake light switch located on pedal. Its a dual device, one switch operates the brake lighyt, and the other is used by the ecu to cancel cruise control, possibly other function. If the two switches disagree, it throws a fault that is indicated by the glow plug light flashing. There is some adjustment possible, but mostly a new switch is required. The fault is self cancelling.
Check your brake lights work when the light is flashing...
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