Greetings to all of you here at MBworld!

I have a 2007 CLK 350 Cabriolet and just replaced the battery. I noticed a small plug loose on the right side of the cabin air intake. Does this attach to the module above and to the right of the cabin air intake? What is the module for? I tried plugging it in but either the module or the plug is defective because it won't stay plugged in. I haven't noticed anything not working.
Thanks for your help!

What is the module at the top right?

Share a picture

Thanks for your help!

What is the module at the top right?

It's air quality (air pollution) sensor. (just in case part #2118300472)

Thanks!