Happily driving along in my 06 CDI when, all of the sudden I got error messages for brakes, ABS, and ESP and I lost power steering. Pulled the codes and the culprit is a bad right rear speed sensor. That code appeared in both the SBC and ESP systems. What I'm confused by is why a failed speed sensor would affect power steering.

Thoughts?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife