Yes, if no episode is mentioned it is usually because it is unknown.

But the Bmw and the Mercedes CLK of the main characters haven't got the number of episode... only because it is unknown?

Episode number indicates from where comes the picture, a comment can then precise that the car is used in a lot of other ones.

Ep 3.04

Lincoln Town Car Stretched Limousine (2 stars):



Mercedes-Benz NG 1632 [NG/SK] (2 stars):



Unknown coupè (2 stars):



Volvo 960 (2 stars):




Ep 3.05

Opel unknown (wagon) (2 stars):



Better pictures for the Fiat Fiorino:




Ep 3.06

Fiat-Hitachi FH220LC.3 (2 stars):



Unknown (2 stars):



Ford Sierra (2 stars):



Better picture and view for the Magirus-Deutz 310 (not 270):



Better picture and view for 1971 Land-Rover 109'' Series III:



1990 Ford Scorpio MkI (2 stars):



Mercedes-Benz G-Klasse (2 stars):







Mercedes-Benz C 200 (4 stars) used by the main characters in all episodes of the 3rd season:




Besides, better picture for the Mercedes-Benz C-Klasse of the polizei, and I think is better remove the number of episodes (like the Mercedes-Benz T [S124] and the Opel Vectra [A]) because it's a police car used in a lot of episodes and in all the season of this tv-series



Better picture also for Mercedes-Benz T [S124]:

http://www.imcdb.org/movie_115088-Alarm-fur-Cobra-11-Die-Autobahnpolizei.html


Ep 3.01

Better pictures for the Audi A4:









Ferrari unknown (2 stars):



Fiat 500 (2 stars) there isn't better view than this:



Mercedes-Benz NG [NG/SK] (it's already listed, it's a page only for the NG trailer truck, but is missing a page for the NG simple truck...):



Porsche 911 Targa (3 stars) (it's already listed, but is a bit different... maybe an another year of production):




Ep 3.02

Better picture for 1981 BMW 320:



Better picture for 1983 Audi 100 Avant:



Better picture for 1984 Citroën Visa II:



Ford Escort MkIII (2 stars):



Mercedes-Benz unknown (wagon) (2 stars):



Yamaha unknown (2 stars):



Mercedes-Benz E-Klasse (2 stars) (it's already listed, but is a very ugly view...)




Ep 3.03


Fiat X/19 (3 stars):



Mercedes-Benz E 320 (2 stars):



Mercedes-Benz SLK 200 (3 stars):





Tomorrow the others 3 episodes