What Causes a Car That Won't Start and Also Can't Lock the Doors?

[LondonLee]

When a car won't start and also can't lock the doors, it may be due to a malfunctioning remote key preventing both starting and locking, or it could be caused by external interference. The specific reasons and solutions are as follows: Damaged Remote Key: If the commonly used key fails to open the door or start the car, try using the spare key. If the spare key works normally, it indicates that the commonly used key is faulty. In most cases, this is caused by insufficient battery power in the key. Solution: Replace the key battery. If the car still won't start or lock after replacing the battery, it's necessary to visit a 4S shop for inspection and repair. External Interference: The remote key needs to emit a signal to unlock or lock the car. The signal from the key may be interfered with by signals of the same or similar frequency, preventing the car from receiving the signal. Solution: Check the surroundings for signal base stations, high-voltage power towers, large electronic screens, etc. Start the car using the mechanical key and try again after moving away from the area.