Kadjar Infotainment Speedometer Error

A fault code and warning messages on both the infotainment system and speedometer definitely point to a central system error. Has any work been done on the car recently, such as software installations or module replacements?

No recent work, just regular servicing. Is there any simple way to reset the codes or check the coding myself?

Given the symptoms and mileage, along with your statement about potentially incorrect vehicle coding, it's plausible. However, without diagnostic tools that can access and modify the vehicle's configuration, any attempts to reset or recode could exacerbate the issue. I recommend taking it to a qualified workshop to avoid unwanted behaviour. They'll be able to properly diagnose and rectify the coding.

Thanks for the advice. Took it to the shop, and you were right. Incorrect coding. Cost 360€ to fix.