I don't think this is it for a couple of reasons. One is that mine was replaced about one year and 10K miles ago, as noted above. Second, I think a bad O2 sensor would not cause the type of miss that I am seeing, very severe. The O2 sensor controls the air/fuel mixture, which would cause car to run too lean or rich, but not cause this severe miss. This seems ignition related, or possibly injector related to me.

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Treiberg's Collection: 1981 240D, 1985 300SD, 1992 300E, 1997 E300D, 2005 C230K