[W116/126Guy]

I'm pretty sure you'll find the tumbler is the only thing that makes the lock unique.
Curiouser and curiouser.... I had no idea that the ignition lock was coded to the ECU... That is what is being implied right?

 

[W116/126Guy]

I'm confused. What do you mean by "ignition control unit"? Do you mean where you put the key in to start the car?

I'm betting he's talking about the ECU... That was my guess too.
So do we have a definitive answer to whether or not the ignition lock was coded to the ECU & if not then why did the dealership send a new ignition lock & key along with the ECU?