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I'm a little confused following Lars' description: According to our US manual and my experience with our JDM car, the speedometer is driven by Speed Sensor 2. Surely the Euro/UK cars are the same?
If I recall correctly....
Speed Sensor 1 measures an internal speed and is used by the transmission control unit to determine when to change gear.
Speed Sensor 2 measures the output speed of the gearbox (ie. Road Speed) and is used to drive all the ancilliary equipment: Speedo, Odometer, Cruise etc. (also connected to the TCU as a backup in case SS1 fails).
Phil.
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