W203 220CDI What is this on AIr filter housing

May 3, 2014 | 06:19 AM

cc260E

Thread Starter

Junior Member

Joined: Apr 2004

Posts: 64

Likes: 0

From: Europe

E420CDI 2008, GLK220CDI 2009

W203 220CDI What is this on AIr filter housing

Hello everybody,

I own a, W203, Year 2002, 220CDI Coupé Sport.

I would like to know what is this indicator located on the Air filter housing.
What is his function?

In advance many thanks

Best regards

Attached Thumbnails

W203 220CDI What is this on AIr filter housing-020520141548.jpg

May 3, 2014 | 02:16 PM

cvx

Member

Joined: Sep 2013

Posts: 139

Likes: 4

From: Finland, Europe

W203 C200CDI

It is supposed to change color when your filter is ready to be changed. Not sure what the knob does anyway, mine been white like yours for the last 20 000km.

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