What causes the alarm to keep sounding after locking an Audi A4?
2 Answers
Audi A4 car alarm keeps sounding after locking: The anti-theft alarm sensitivity is too high. There is a sensitivity adjustment knob on the vibration sensor of the anti-theft alarm, which can be fine-tuned; The door grounding wire is faulty, commonly known as the door switch failure. The alarm adjustment box is usually located under the dashboard, with adjustment knobs that can be tweaked by yourself. Alternatively, you can seek help from the professional who installed the alarm. Precautions for locking the car: Using a mechanical key is safer than using a smart key, as it avoids interference from signal jammers. When using a mechanical lock, ensure the doors are properly closed and listen for the sound of all doors locking to confirm the car is securely locked. Check if the lights flash after locking. If using an electronic lock, observe whether the car is properly locked by checking if the lights flash or if the side mirrors automatically fold. If any abnormality is noticed, promptly check for signal interference sources nearby. Pull the door handle to confirm locking. After locking, it's advisable to habitually pull the door handles to ensure the doors are locked. Be gentle when pulling to avoid damaging the door switch mechanism.
I once drove an Audi A4, and the car alarm kept going off, which was quite annoying. There could be many possible reasons. The motion sensor of the anti-theft system is too sensitive—even a slight breeze or strong vibrations from the roadside can trigger a false alarm. Another common issue is that the doors or trunk aren’t properly closed, especially if your key remote malfunctions and the car doesn’t lock securely. Electronic module failures are also not uncommon, such as a short circuit or aging in the anti-theft control module. Another possibility is low battery voltage or unstable power supply, which may cause the system to mistakenly detect an intrusion. I suggest first manually checking if the doors are locked properly and then trying to lock the car again. If the alarm continues to sound, it’s best to visit a 4S shop to scan for fault codes with diagnostic equipment—don’t delay to avoid draining the battery and affecting other electronic components. During regular maintenance, ask the technician to test the anti-theft system as a preventive measure.
