C4 fault memory lock active

I have a C4 too, and I had a similar problem a while back. Could be due to undervoltage in the system, which can cause all sorts of weird errors in the car's electronics.

Undervoltage, huh? Interesting. So, what exactly did you do to fix it? Was it a simple fix, or did you have to dive deep into the car's brain?

In my case, undervoltage was indeed the culprit. I'd suggest getting the battery and charging system checked professionally. I ended up taking mine to a workshop, as automotive diagnostics can be tricky.

Cheers for the advice! I took it to a shop, and you were spot on – undervoltage. They sorted it out for 240€. Thanks again for the help!