Critical Warning Lights (Red)
These indicate a serious issue that requires immediate attention:
Check Engine Light: This indicates a problem with the engine or emissions system. It could be caused by a loose gas cap, a faulty oxygen sensor, a catalytic converter issue, or more serious engine problems. Stop driving and have it diagnosed as soon as possible.
Oil Pressure Warning: Indicates a loss of oil pressure. Check the oil level immediately and top up if needed. If the light stays on, stop driving to avoid engine damage and have it towed for repairs.
Brake Warning Light: This may indicate critically low brake fluid, worn brake pads, or a problem with the brake system hydraulics or ABS. Have your brakes checked immediately.
Coolant Temperature Warning: Indicates the engine is overheating, likely due to a low coolant level or a malfunctioning thermostat, water pump, or radiator fan. Pull over and let the engine cool before checking coolant levels. Have the cooling system inspected.
Battery/Charging System Warning: The battery is not being charged properly due to a failed alternator, worn-out battery, or loose/corroded connections. Have the charging system tested as soon as possible.
Airbag Warning Light: This indicates a problem with one of the airbags or seat belt pre-tensioners that could prevent them from activating in a crash. Have the airbag system diagnosed as soon as possible.
Non-Critical Lights (Yellow/Orange)
These suggest an issue that needs attention but isn’t an immediate safety risk:
Tyre Pressure Warning: One or more tyres have low air pressure. Check and adjust the tyre pressure.
Traction Control/Stability Control Light: Indicates the traction or stability control system is active or has detected a fault. Use caution in slippery conditions. Have the system checked to see if the light stays on constantly.
Antilock Brake System (ABS) Warning: The ABS has been deactivated due to a fault, but normal braking still works. Have ABS serviced.
Maintenance Reminder/Service Light: Indicates the vehicle is due for scheduled maintenance, like an oil change. Not an immediate concern, but have a full service done soon.
Loose Gas Cap: The gas cap is loose, not fully tightened, or missing. Tighten or replace the cap. The light should reset after a few drive cycles.
Informational Lights (Green/Blue/White)
These indicate a system is working properly or has been activated:
Turn Signals: One of the turn signals is activated.
High Beam Headlight Indicator: The high-beam headlights are on.
Cruise Control: The cruise control system is activated and maintains a set speed.
Fog Lights: The front or rear fog lights are turned on.
While not exhaustive, this covers the key warning lights found in most vehicles. Always consult your owner’s manual for the specific meanings in your vehicle. If a red warning light comes on, stop driving and have the issue diagnosed immediately. For yellow lights, have the vehicle checked out as soon as possible to prevent a more serious problem from developing.
