The inspections are legally mandated every two years. The car must satisfy the requirements to pass or it won't be allowed on the roads. If the car is obviously not compliant, then you can be sent to extraordinary inspection even if you just passed.
What a guy resident in California says could not be more irrelevant to vehicle inspections performed in Germany where the car is subjected to much worse weather + salt on the roads.
What a guy resident in California says could not be more irrelevant to vehicle inspections performed in Germany where the car is subjected to much worse weather + salt on the roads.