Can you describe the problem you are having?

I would assume you have tried multiple keys? I have worn out both original keys which came with my '98 and had to buy replacements. They became intermittent (sometimes they would work, sometimes not).

I think you unscrew the ring around the lock to release it and work from the back beneath, but I have only heard of one W210 ever needing a new ignition lock so that is why I asked what trouble you were having.

You can loosen the locking ring with one of those "grippy" rubber pads used as a jar opener. That's what I used to tighten mine. When I got the car it was loose and drove me nuts.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz