Have you ever wished you could unlock and lock your Audi car without fumbling for your keys?
If you have a smart key and a keyless entry system, you can do just that. But what if your keyless entry system stops working or becomes unreliable?
In this article, we will explain the possible causes and solutions for Audi keyless entry not working problems, and how to diagnose them using a diagnostic tool. Read on to find out more.
How To Fix Audi Keyless Entry Not Working Issues?
#1. Change the Battery in the key fob
Replace the Battery: Purchase a new battery (usually CR2032 or CR2025) from electronics stores.
How to Replace Audi Key Fob Battery?
1 Remove the emergency key by pressing the button on the back and sliding it out.
2. Use a flat-head screwdriver to open the smart key case along the seam.
3. Replace the old battery with the positive side facing up.
4. Snap the case together and reinsert the emergency key.
5. Test the keyless entry by touching the door handle.
#2. Maintain Distance or Power Down Other Devices
Minimize interference by keeping the smart key away from devices like cell phones and laptops, or turn these devices off when approaching the car.
Use Alternative Methods: If interference persists, manually use the emergency key or the key fob buttons to lock and unlock the car.
#3. Fix the faulty door sensor
Diagnose the Issue: If the keyless entry fails to respond, check the door sensor functionality.
Professional Assistance: If the sensor is found to be faulty, consult a professional mechanic or an Audi dealer to replace the sensor. This process may require technical skills and tools.
Part Number for Sensor Replacement: 8H0959985B or 4L0839884A, depending on the car’s model and year.
#4. Replace Faulty Antenna
You should inspect the functionality of the antenna located in the rear bumper.
Seek Professional Help: If the antenna is damaged or malfunctioning, consult a professional mechanic or Audi dealer to replace it. This task may involve technical expertise and specialized tools.
Part Number for Antenna Replacement: 8E0907273F.
#5. Move Closer to the Car
If the keyless entry isn’t working, try standing closer to the car. Sometimes, the signal strength might not be sufficient from a distance.
#6. Use Backup Key
Most keyless entry systems have a backup physical key hidden within the key fob. Use this key to manually unlock the car and access the interior.
#7. Reprogram the Key Fob
Reprogramming can often resolve connectivity issues between the key fob and the car.
Refer to your Audi owner’s manual for instructions on how to reprogram your key fob. You may need another working key fob or an Audi dealer to assist you with this process.
#8. Check Car Battery
If your car’s battery is weak or dead, it can affect your keyless entry system as well as other electrical components in your car.
Check your car battery’s voltage using a voltmeter or a diagnostic tool. If your battery is low, you may need to jump-start your car or replace your battery.
Why is Audi Keyless Entry Not Working?
#1. Low Battery in the Smart Key
The smart key relies on a functioning battery to communicate with the car’s antenna and sensors.
A low or dead battery can lead to sporadic or complete failure of the keyless entry system.
#2. Interference from Other Devices
Radio frequency interference from devices like cell phones, laptops, and wireless headphones can disrupt the communication between the smart key and the car’s security system, causing the keyless entry to malfunction.
#3. Faulty Door Sensor
Each door is equipped with a sensor in the handle that detects touch.
If this sensor is faulty or disconnected, it can prevent the keyless entry system from receiving the necessary signals to unlock or lock the doors.
#4. Faulty Antenna
The antenna, usually located in the rear bumper, receives and sends signals between the smart key, door sensors, and the car’s central system.
A malfunctioning or damaged antenna can hinder proper communication, leading to keyless entry failure.
#5. Car Battery Issues
If the car’s battery is weak or dead, the keyless entry system might not work. Some keyless entry systems rely on the car’s battery to function properly.
#6. Software Updates
Audi periodically releases software updates for their vehicles, which can include improvements and bug fixes for the keyless entry system. Check with your local dealership to ensure your vehicle’s software is up to date.
#7. Deactivated Keyless Entry
It’s possible that the keyless entry system was accidentally deactivated. Check your owner’s manual for instructions on how to reactivate the system or consult your Audi dealership for assistance.
Visit a Professional
If none of the above steps work, it’s recommended to visit an authorized Audi service center or a qualified automotive locksmith. They have the tools and expertise to diagnose and fix more complex issues.
To diagnose which part of the keyless entry system is causing problems, it is recommended to use a diagnostic tool such as VAGCOM to scan the vehicle’s diagnostics system.
It will display any error codes related to the keyless entry system and indicate which component needs attention.
The keyless entry system is a convenient and secure feature that enhances the driving experience of Audi owners.
However, like any other electronic system, it can encounter problems due to various reasons.
By following these tips and solutions, Audi owners can troubleshoot and fix their keyless entry system issues and enjoy their cars without hassle.
