What Do the Warning Lights Mean on a Volvo S40?

Vehicle warning lights are found on all makes and models, including Volvo, and are used to help notify the driver of any issues with the components of the vehicle. There are warning lights for, but not limited to, the oil pressure, battery voltage, brake system and engine temperature of a vehicle.

Each warning light features a symbol relating to the system it is used for. Brake lights will often have a circle, surrounding the letters ABS, which stand for Anti-lock Brake System. The temperature light will have a thermostat on top of a line, which is used to signify the coolant, while the oil pressure light uses an outline of a canister of oil.

When a light turns on, the vehicle's computer system is not reading the proper signals from each sensor. Depending on which light turns on, the driver should respond accordingly. Low-priority lights, such as the battery and gas cap, can be handled less aggressively then higher priority lights such as the one used for oil pressure.

Higher priority dash lights include systems that can damage the engine if they are not operating properly. The oil pressure light, for example, is used to inform the driver that oil pressure has dropped inside the engine. When oil pressure drops, the engine loses lubrication in its internal components, which can cause severe damage.