Just so you knowamber light
Glow Plug (Diesel)
Normal at start-up on a diesel — only a problem if it stays on.
What it means
An amber icon that looks like two or three coiled springs. On a diesel, this lights up briefly when you switch on the ignition while the glow plugs pre-heat the cylinders for easy starting. Wait for it to go out before cranking. If it stays on, flashes, or comes on while driving, there’s a fault.
What to do
- 1At cold start: wait for the light to go out before turning the key further.
- 2If it stays on or flashes after starting: book a diagnostic — usually a failed glow plug or relay.
- 3Hard cold-starting and white smoke on a frosty morning is the classic symptom.
Likely causes
- •One or more failed glow plugs
- •Faulty glow plug relay or control module
- •Wiring fault in the glow plug circuit
Rough UK cost
Glow plug: £80–£200 per plug fitted. Relay/module: £150–£400.
Prices are a guide only — always get a written quote before any work.
Heads up: Carautonomy is for general guidance only. If your car is behaving oddly or any red light is on, get it inspected by a qualified mechanic.