Can't help with the display issue; the W210 has a K40 relay that replaced the OVP. Is the first item in the front of the computer box on the right side of the engine compartment. The computer board can develop minute cracks and cause intermittent electrial problems in numerous systems.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)