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Why the key turn in ignition of a Mercedes 300E?

It sounds like you're asking about the ignition lock cylinder in a Mercedes 300E and why it might be giving you trouble. Here's a breakdown of the potential issues and why it might be acting up:

Possible Causes:

* Worn Keys: Over time, your key can become worn and lose its shape, making it difficult to turn the cylinder.

* Dirty or Damaged Cylinder: The cylinder itself can accumulate dirt, debris, or suffer wear and tear, making it difficult for the key to engage properly.

* Broken or Worn Pins: The pins inside the cylinder help match the key's profile. These can break or wear down, making it difficult for the key to turn.

* Steering Column Lock: The steering wheel might be locked, preventing the key from turning. This is a safety feature designed to prevent theft.

* Electrical Problems: While less common, there could be a problem with the ignition switch itself or the wiring connected to it.

What to Do:

1. Clean the Cylinder: Try using a can of compressed air to blow out any dirt or debris. You can also carefully use a lubricant like graphite powder. Be careful not to push anything into the cylinder.

2. Check the Key: Inspect your key for signs of wear and tear. If it's significantly worn, it's best to get a new key cut.

3. Try Turning the Steering Wheel: Make sure the steering wheel is unlocked and can turn freely.

4. Consult a Mechanic: If the above steps don't solve the problem, it's best to consult a qualified mechanic. They can diagnose the issue and determine whether you need a new ignition lock cylinder, key, or repair.

Safety Note:

Be careful when working with the ignition cylinder. Avoid force or attempting to bypass the lock.

Let me know if you have any other questions!