What type of problems are you having with your locks? Is it the ignition? I had a problem getting my key in the ignition, but the door locks worked fine. My friends told me to lubricate the lock with WD40 or something. As it turned out, the guts of the ignition had broken into pieces in there and I had to have the entire mechanism replaced. Luckily, I got the key in there (it took about 20 - 30 minutes) and drove it to the dealership. They said that it was a good thing that I was able to get the key in there, otherwise it would have had to be drilled out. That could get expensive. Nevermind the tow bill. I don't mean to scare you with a near-horror story, I just get nervous when the key doesn't want to go in the slot.

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Kyle De Priest
2007 e320 Bluetec
2013 GLK 250 Bluetec