The police may tow your car away if it obstructs the traffic or endangers other people. Watch out for fire brigage access roads which are marked with small signs reading "Feuerwehrzufahr" (some from google image search). There is no stopping and standing, parking will result in more or less immediate towing.
If your car has been towed away contact the next available police station. There is a central place where all towed cars will be brought to (Thomas-Hauser-Str. 19, open 24/7; S2/S4 to station "Berg am Laim", Bus 146 to Iltisstrasse until stop "Thomas-Hauser-Straße", 5 min to walk from there). You need to show your passport/ID, drivers licence and registration document and you have to pay the fine. Fines vary, expect around 150€.
A constant harassment are private towing companies which guard private parking spaces such as that of supermarkets. Their "fines" can easily double or triple the police's fines.
The Most Frequently Asked Travel Questions about Munich
Where To Stay & Best Hotels in Munich - updated May 2024
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Munich Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.