Skoda Roomster electrical issues

Overvoltage issues can be tricky. The Roomster's electrical system is sensitive, and a failing battery can cause weirdness. When the voltage dips, modules act up and throw codes. Have you checked the battery's voltage? A fully charged battery should be around 12.6 volts. Also, are the battery terminals clean and tight?

I haven't checked the voltage yet, but will do that tomorrow. Terminals look okay, no corrosion. If the voltage is low, does that definitely mean the battery is the culprit, or could something else be draining it?

A low voltage reading is a strong indicator. Think of it like a water pump struggling to supply enough pressure. The electrical system needs a stable voltage to function correctly. While a parasitic drain is possible, the 'weak battery' symptom points towards a failing battery. Given the age of the car and the symptoms, I'd suggest getting the battery professionally tested or replaced. It's likely the root cause. These electrical issues can affect circuit protection, and a power surge can have detrimental effects. It is recommended to go to a workshop for a professional diagnosis.

It was the car battery. Replacing it cleared all the errors. Cost 290€. Thanks for the help.