ticking sensor?
 

There is a sensor/switch located near the front drivers side of my '02 C320. It has a metal tube attached as well as an electrical connector. It is about the size of a small aspirin bottle. I noticed it makes an audible tick, tick, tick noise similar to a high voltage electrical arcing sound. It will do this for a minute or two, then stop, then start again. The ticking is relatively fast. About 2-3 times per second. Also, you can "feel" the tick if you touch the unit.

Can someone tell me what this is and should it be doing this?

Thanks
Brian

Is it black and does it have the word "MOT" and a arrow on it?


Sounds like the purge valve.


Joe

Can't remember any identifying marks. I'll take a look at lunch time...

Brian

Joe,

It does have MOT and the arrow. Should this be making the noise I described?

Brian

The Purge valve had a mount change to quiet them down.
Do a search in the archives for the the info or try a Dealer parts dept.