Matiz Key Fob Battery

Indeed, the symptoms you describe strongly suggest a depleted battery within your key fob. Has the effective range of your key fob diminished noticeably prior to the complete failure of keyless access? In such scenarios, a weakened battery is almost invariably the culprit, and it's the first thing any technician would check as well. Were there any other symptoms besides the error code?

Yeah, the range was getting worse for a while before it died completely. Just the error code and the keyless entry failing, nothing else unusual. Are these batteries something I could replace myself, or is this something I should leave to, say, a workshop?

Given the preceding degradation in range, the diagnosis of a depleted key fob battery appears conclusive. While battery replacement is theoretically a task achievable by most owners, certain vehicles require specific tools or diagnostic resets post-replacement. Without explicitly knowing your aptitude and tool availability, I would cautiously advise you consult a qualified technician to mitigate the possibility of unforeseen complications. It might be worth it!

Thanks for the advice! Took it to a local garage, and you were spot on - it was just the key battery. They swapped it out for about 37€, and everything is working perfectly again. Appreciate the confirmation!