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Warning lamps identify a system or protection concern. Use the symbol, behavior, and vehicle evidence to choose the next safe check.
Warning lamps are signals with different urgency. Keep the lamp, messages, symptoms, and scan evidence together before selecting a repair path.
Follow the sequence, stop when evidence changes the path, and verify the exact vehicle information before acting.
Urgency is deliberately qualitative. The exact owner's manual and the vehicle's behavior control the final decision.
The engine or emissions control system has detected a condition that should be investigated. The lamp alone does not identify a failed part.
The vehicle has detected a charging-system or electrical-generation concern. The battery symbol does not by itself prove the battery failed.
The vehicle is warning about a possible lubrication-pressure condition. A sender or wiring fault is possible, but true low pressure can damage an engine quickly.
The engine or cooling system is reporting excessive temperature or a related protection condition. The warning does not identify whether the cause is coolant loss, airflow, circulation, control, or internal leakage.
The lamp may indicate an applied parking brake, low fluid, hydraulic concern, or another vehicle-specific brake-system condition. The symbol alone cannot prove the brakes are safe.
The anti-lock braking system has reported a fault or has been disabled. Base braking may behave differently, and the exact effect depends on the vehicle and any other warning lamps.
The traction-control, stability-control, or related chassis-control system has reported a fault, has been switched off, or is actively intervening. The lamp alone does not identify a failed sensor or module.
The system may be reporting low tire pressure, a sensor/communication problem, or a relearn/registration condition. Measure the tires before diagnosing electronics.
The supplemental restraint system has detected a fault or is not fully available. A lamp is not a reason to probe connectors or install a used restraint component.
Flashing, steady, hot, braking, starting, or losing power changes the diagnostic path.