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Thread Starter
Newbie
Joined: May 2020
Posts: 4
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2001 c200
new here
Just signed up. Have been looking at threads for a while and most are super useful, but I've came across a problem with my car that has got me stumped.
I have a 2001 c200 kompressor, which lately had a rough idle issue and hunting when I start it from cold, which goes away significantly once the car is put into drive. No CEL, no stored or pending fault codes either. Took it to the mechanics, and after testing the only fault description that came up was 'unknown fault'. Car doesnt stall, mpg is fine and there is no loss of power at all. At wits end as to what may possibly be wrong with my car?
I have a 2001 c200 kompressor, which lately had a rough idle issue and hunting when I start it from cold, which goes away significantly once the car is put into drive. No CEL, no stored or pending fault codes either. Took it to the mechanics, and after testing the only fault description that came up was 'unknown fault'. Car doesnt stall, mpg is fine and there is no loss of power at all. At wits end as to what may possibly be wrong with my car?
MBWorld Fanatic!
Joined: Jan 2019
Posts: 3,892
Likes: 965
From: Melbourne, Australia
2013 C204 C250 Coupe
Welcome to the forum! Try your query in the W203 forum where other owners may be able to assist. Please post a photo of your C-Class when you get a moment. Good luck with it 
Out Of Control!!
Joined: Sep 2018
Posts: 14,668
Likes: 4,570
From: unbegrenzt
2017 GLE350 4MATIC
Welcome! Rough idle can be caused by an intermittent sensor. Crank, cam, air flow and throttle position sensors are the main ones. Have a look and tap with your hand or screwdriver while the engine is idling to see if you can force the rough idle to come and go. Careful with your hands in the engine bay while the engine is running.
