Etios radar sensor failure

It does sound like a radar sensor issue, yes. Often those kinds of errors will cascade and cause other systems to report problems. Have you checked to see if the sensor itself is obstructed or dirty? That's the most common cause. Where is the sensor located on your Etios?

I haven't located the sensor yet. Where should I look?

On your Etios, the radar sensor should be behind the front bumper, usually near the license plate. Have a look and see if it's covered in dirt, snow, or anything else. If it is, give it a careful clean with a soft cloth. If the issue persists after cleaning, it's best to visit a workshop to get it checked out properly if the issue persists after cleaning.

Thanks for the advice. It was just a dirty sensor. Cleaned it, and all errors are gone. Cost me 45€ for the cleaning. Appreciate the help!