What are the reasons for the four-wheel drive malfunction indicator light to illuminate?

[MariaRose]

The reason for the four-wheel drive malfunction indicator light to illuminate is caused by the fuel emission system. There are three types of indicator lights: 1. Engine oil indicator light: This light is used to display the oil pressure condition inside the engine. It illuminates when the ignition is turned on during the vehicle's self-check and turns off after the engine starts. According to Yuanhang Driving School, if this light stays on, it indicates that the engine oil pressure is below the specified standard and requires maintenance. 2. Coolant temperature indicator light: This light primarily displays the temperature of the coolant in the engine. It only illuminates for a few seconds during the vehicle's self-check and remains off under normal conditions. If the coolant temperature exceeds the specified value, the vehicle should be stopped immediately for maintenance. 3. Handbrake indicator light: This light is represented by a circled 'P' letter and remains off under normal conditions. It automatically illuminates when the handbrake is engaged. Currently, only some vehicle models have a warning sound when driving with the handbrake engaged.