50 Car Dashboard Warning Lights Explained: What They Mean and What to Do (Guide)part 4

21. Glow Plug Warning Light (Diesel Engines)

This warning looks like a small orange coil or spring. It appears mainly in diesel vehicles.

What it means:
  • The glow plugs are heating the engine before starting.
  • If it stays on or flashes after starting, there may be a fault.
What to do:

Wait for the light to go off before starting the engine. If it keeps flashing, have the glow plug system inspected.

22. Diesel Particulate Filter (DPF) Warning Light

This warning indicates that the diesel particulate filter is becoming clogged.

Possible causes:
  • Frequent short trips
  • Blocked DPF
  • Engine management problem
What to do:

Drive at a steady highway speed for 20–30 minutes if your owner's manual recommends it. If the light remains on, have the DPF checked by a mechanic.

23. Service Required Warning

This reminder tells you that your vehicle is due for scheduled maintenance.

Typical services include:
  • Engine oil change
  • Oil filter replacement
  • Brake inspection
  • General vehicle inspection
What to do:

Book a service as soon as possible to keep your vehicle running safely and efficiently.

24. Automatic Start/Stop Warning

This light relates to the automatic engine start/stop system.

What it means:
  • The system is temporarily unavailable.
  • There may be a battery or sensor issue.
What to do:

The vehicle is usually safe to drive, but have the system checked if the warning remains on.

25. Cruise Control Indicator

This symbol shows that cruise control has been switched on.

What to do:

This is not a fault. Always stay alert and be ready to brake or steer even when cruise control is active.

26. Adaptive Cruise Control Warning

This warning appears if the adaptive cruise control system cannot operate normally.

Possible causes:
  • Dirty radar sensor
  • Heavy rain or fog
  • System malfunction
What to do:

Clean the front radar area and have the system checked if the warning continues.

27. Lane Departure Warning

This symbol usually shows lane markings on a road.

What it means:
  • The vehicle is drifting out of its lane without the turn signal being used.
What to do:

Steer back into your lane safely and remain focused on the road.

28. Collision Warning Light

This warning alerts the driver that a collision may be imminent.

What to do:

Brake immediately if necessary and keep a safe following distance from the vehicle ahead.

29. Key Fob Battery Warning

This light indicates that the battery inside your smart key is running low.

What to do:

Replace the key fob battery soon to avoid being locked out or unable to start the vehicle.

30. Immobilizer/Security Warning Light

This symbol usually looks like a key or a padlock.

Possible causes:
  • Unrecognized key
  • Faulty immobilizer system
  • Key battery failure
What to do:

Try using a spare key if available. If the warning remains, the vehicle may need professional diagnosis before it can be started.

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