Renault Master fault memory lock active

I had a similar issue with my Master. It could be undervoltage causing the ECU to throw a fit. Have you checked your battery and alternator recently? How old is the battery?

Battery seems fine, though I haven't tested it under load. How did you figure out it was undervoltage? Did you get any other symptoms?

I didn't diagnose it myself. The workshop checked the fault codes and said it was likely caused by an undervoltage issue affecting the computer system. They suggested a proper diagnostic check to confirm.

Thanks for the info. I took it to a workshop, and it turned out to be exactly that – undervoltage. Cost me 240€ to sort out. Appreciate the help!