Help Identifying part needed

[RudeSkaBoyUK]

Good evening all,

I own a B class 180 b CDI 2014

I hope someone here can help me with this.
My wife came back from work with car saying its making a funny noise. I took it for a quick drive and it sounded like a leaking or cracked exhaust manifold. I opened bonnet and took of plastic engine cover to see if I could find the noise. I immediately noticed just to side of turbo on exhaust system a threaded hole.
It looks to me like some kind of sensor or just a metal threaded plug has unscrewed itself and is now missing. I presume its probably just a plug because a sensor would have wiring attached which would then still be able to be found and screwed back in.
Is this a common fault and how easy is it to get the part?

 

[richard]

Can you take a photo please ?

 

[RudeSkaBoyUK]

 

[RudeSkaBoyUK]

hope these pictures have come through

 

[pmcgsmurf]

That looks like the blank or O2 sensor on the cat, some have blanks in them.

If it's a blank it could be part number such as A6079900017 but best check with VIN and parts department.

 

[pmcgsmurf]

The way a blank should look.

 

[55AMGCLK]

If it is just the screw then you may just find it has fallen down into the engine under tray.

 

[RudeSkaBoyUK]

It was a blank like the photo above. Managed to order one up to a local Mercedes dealer and I fitted it today.
Strange how the old one had come loose.
Will check the tightness of this every few weeks .

 

[pmcgsmurf]

It was a blank like the photo above. Managed to order one up to a local Mercedes dealer and I fitted it today.
Strange how the old one had come loose.
Will check the tightness of this every few weeks .

That's good, easy enough fix.

How did you manage to get from Edinburgh (Newbridge ?) thought the parts department was closed?