[computatrum]

Preheating is not in general forbidden in Germany, but you need a proper stationary heating system (can be even combustion based). Lexus probably has implemented it with the main combustion engine as remote start, which is a poor-man solution and considered inefficient and illegal.

[sam_lowry_]

Modern trucks have webasto heaters even for main engines to reduce NOx emissions.

And VW T6 Multivan and California often have two, the other for interior pre-heating.

OTOH remote engine start is dangerous and not just inefficient.

Think of all CO that it may emit in a closed box.