In a Citroën Picasso 1.9 Turbo Diesel from the 2002 model year, the plug heater light, also known as the glow plug indicator, is typically located on the instrument panel. It usually appears as a symbol resembling a coil spring or a filament. This light illuminates when the ignition is turned on and goes out once the glow plugs are heated sufficiently for starting the engine. If the light stays on or flashes after starting, it may indicate a fault with the glow plug system.
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