Hi,
I don't know if this is the same but my 1999 S-80 T6, after repairing it's transmission did not want to start. It would crank but not start. It took 3 weeks & 3 different mechanic shops to find that it was the battery cable running over the speed sensor. As the car got older the electrical field in the battery cable grew & interferred with the speed sensor. The tach would jump. The speed sensor told the car that it was already started. The battery cable was lengthend & now does not cross over the engine. It works just fine now. Good Luck, Sandy When the dealer gave up I almost had it towed to a junkyard.
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