If your Audi randomly won’t lock, won’t unlock, or acts like the door is open when it isn’t — this video is probably for you.

In this video, I’m replacing the driver side door lock actuator on a 2018 Audi A4 B9.

This is a very detailed, step-by-step tutorial, made for people who don’t normally work on cars. I don’t skip steps and I don’t assume you already know how things come apart — I show exactly what I’m doing and why.

I go through:

- Removing the driver side door panel
- Accessing the door lock actuator
- How the cables, connectors, and clips are actually attached
- How to remove and install the actuator correctly
- Small details that can easily trip you up if it’s your first time
- Testing everything before putting the door back together

If your Audi A4 B9 doesn’t lock or unlock properly, locks randomly, or stopped responding to the key fob or door handle, the door lock actuator is a very common failure point.

This applies to Audi A4 B9 models from 2015–2025, and the process is very similar on A5 / S4 / S5 with the same door setup.

This isn’t a rushed tutorial — it’s filmed as a real repair, with the goal of making sure you can actually follow along and do it yourself.

If this helped you, drop a like and if you have any questions let me know in a comment. I'll be happy to help you out.

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Hochgeladen am 10.02.2026   Problem melden   Dieses Video bei YouTube   Tom Kos Cars bei Youtube