123 on the right (USA passenger's) side, 456 on the left (USA driver's) side:

 

Thank you. Printing this now. I guess I need to get a service manual. Would you recommend Chilton, Haynes, or other?

 

I would recommend WIS - MBZ's official Workstation Information System. You can get a "copy" on eBay for around $30.

Oh, and regarding coil issues...if one has an error, I suggest swapping it with another to see if the error follows the coil or the cylinder. If it follows the coil, then replace it. If it follows the cylinder, then swap (or replace) the plug.

 

Thank you I will check that out

 

I need to replace a coil pack / ignition module on a certain cylinder. On the M272 V6, Is it correct that cylinder number one is at the front of the engine on the drivers side and that cylinder number four would be at the front of the engine on the passenger side?
In other words, 1 2 3 on drivers side and 4 5 6 on passenger side?

 

It's the opposite sides - 1 is the front cylinder on the right (USA passenger) side, then 2 and 3 on the back. 4 is the front cylinder on the left front (USA driver) side, then 5 and 6:

F
R 1 2 3
O
N 4 5 6
T

 

Cilinder location 2014 Mercedes-Benz C350 4Matic 3.5

 

Same as post #7 above.

 

I would recommend WIS - MBZ's official Workstation Information System. You can get a "copy" on eBay for around $30. Oh, and regarding coil issues...if one has an error, I suggest swapping it with another to see if the error follows the coil or the cylinder. If it follows the coil, then replace it. If it follows the cylinder, then swap (or replace) the plug.

hello good day just clarify for me please because this coil is coming as one unit with its computer So what do you mean when you're saying replace or swap the plug in the past I have changed now it shakes I need to change #3 as well