Do steering wheel covers require official approval?

There is no general operating permit (ABE) for steering wheel covers.
Steering wheel covers are usually accessories that are added to the steering wheel afterwards and are not permanently attached to the vehicle.

Since these are not permanently installed parts, many countries do not have specific regulations or rules for steering wheel covers.
It's important to make sure that any accessories, including steering wheel covers, do not obstruct the driver's view and are securely attached to the steering wheel.

It's a good idea to familiarise yourself with local traffic regulations and ensure that any modifications or additions to your vehicle comply with local laws.
If in doubt, it can be helpful to contact the relevant traffic authority directly for accurate information.