05 e350 changed RF bearings and seal abs light on

[HansMantis]

Sorry it's an 06. I changed the bearings and seal and now the abs light comes on after about thirty feet. Apparently the grease seal is also the tone ring for the wheel speed sensor. I put a new seal in from Mercedes, and cleared the codes, but the light comes back on. The code is, "check RF wheel speed sensor." I then switched the front sensors, cleared the code, and it still says RF. I think the problem is something about installing the grease seal. Is there a special procedure or tool required? Any help is appreciated.

Thanks,
Hans