Hello, I'm looking for help please. I need to work out which is faster to change: the rear reluctor ring on 2001 CLK 230 K OR the whole (half) drive shaft? Bought it needing MOT'D started reading the forums have replaced speed sensor, cleaned out Mass, done brake light switch. Finally got a shot on a ramp today & may have found the culprit for most of the light show on the dashboard. Thanks.