Glow Plug Warning Light (Preheat Light)
The glow plug light on diesel cars shows that the glow plugs are heating the engine before a cold start.
What is Glow Plug Warning Light (Preheat Light)?
It is amber and shaped like a coil. Wait until it goes out before you crank the engine. On many cars, the same light flashes to signal an engine fault. Modern diesels often preheat so quickly that the light only shows for a moment.
How it works
The glow plug control unit powers the plugs and keeps the light on while preheating.
Why it matters for your car
A flashing glow plug light usually means a stored fault; have it read. Slow cold starts can point to failed glow plugs.
Other terms
- AdBlue Crystallisation (Urea Deposits)
- Airing Down (Lowering Tyre Pressure Off-Road)
- Ball Joint Splitter
- Blow-off Valve (Diverter Valve)
- Dashboard (Dash Panel)
- DOHC (Double Overhead Camshaft)
- Door Card (Door Panel)
- Door Handle
- Head-up Display (HUD)
- High-pressure Fuel Pump
- i-Size Child Seats (UN R129)
- Keyless Entry And Start
- Lidar Sensor
- LIN Bus
- Miles Per Gallon (MPG)
- New Car Warranty
- Rear-View Mirror (Interior Mirror)
- Service History
- Side Window
- Windscreen Demisting (Defrost)