What is the reason why the Audi A3 auto start-stop suddenly cannot be used?
2 Answers
Most of the time, it will prompt when the battery power is low. Manually turn off the auto start-stop function, turn off the air conditioning, electric heating, car lights, etc., and press the screen, drive for a while to charge. After that, restart the auto start-stop. If it still doesn’t work, drive to a 4S shop for inspection. Note that when the start-stop function is turned off, you need to step on the brake during temporary parking. The auto start-stop is a system that can automatically control the engine to shut down and ignite. In the case of a short stop, the engine automatically "sleeps", which is mainly suitable for waiting for traffic lights or traffic jams in urban traffic. The precautions for auto start-stop are as follows: 1. Avoid using the start-stop system on slopes: When temporarily parking on a slope, the start-stop system should still be avoided as much as possible. The start-stop system starts slowly, and it is easy for the vehicle to slide when the brake is released. The engine does not have time to ignite, and the braking force is insufficient, leading to danger. 2. Turn off the start-stop system during irregular stop-and-go driving: Turning off the start system improves ride comfort more than reducing that little fuel consumption. At the same time, stopping and starting again obviously makes the starting speed worse than others. 3. Try not to enable the start-stop system when the air conditioner is on: The vehicle is equipped with an air conditioner to increase ride comfort, but most vehicles with a start-stop system will only blow air but not cool (heating uses the vehicle’s water tank temperature) when the engine is turned off, greatly affecting ride comfort. At the same time, if the difference between the detected temperature in the car and the set value is too large, the engine will automatically start. Frequent start vibrations greatly reduce ride comfort.
My Audi A3's start-stop system suddenly stopped working a few days ago, and I later figured out that such issues are mostly due to conditional restrictions. The start-stop system requires multiple conditions to be met simultaneously to trigger, such as sufficient battery charge, appropriate cabin temperature, and seatbelts being fastened. If your battery has been in use for three to five years, especially when voltage drops in low winter temperatures, the system will automatically disable this function. Additionally, if the engine hasn't warmed up yet or the air conditioning is blasting cold air, the start-stop feature will also be temporarily disabled. The most easily overlooked factor is the steering wheel angle—it won't activate if the wheel isn't straightened during turns. I recommend observing your driving conditions for a few days first. If these factors are ruled out, then proceed to check the electrical circuit module.
