Warning Light Colours (Red, Amber, Green)

The colour logic is broadly shared across manufacturers and follows international symbol standards. A flashing light is usually more urgent than the same light shown steadily. Most lights come on briefly as a bulb check when you switch on the ignition. The owner’s manual has a full list of symbols for your car; many manufacturers also explain them in their app.

The instrument cluster switches on a symbol when a control unit reports a fault or a system state.

Never ignore a red warning light; stop safely and check the owner’s manual. A light that stays on after the start-up check points to a fault worth diagnosing.