[s-cars] S6 left me stranded on the highway

[Azeem Elahi]

I was on the onramp, getting up to speed to merge onto the freeway when the
car just died on me (shutoff).  While I was coasting, I tried to restart it,
but it would promptly shut right back off right away.
I decided it was safer to just coast the car to the shoulder and have it
towed.  When I got out to inspect, I noticed the driver's side bottom samco
hose had popped off.
The car's at the shop now here in Chicago, and I'm told there was a fault
code for an engine speed sensor.
I brought up the idea of the crank position sensor because I remember
reading several posts about this in the FAQ.  Does the CPS just fail
suddenly, or are there usually signs before failure?  The car was
trouble-free before this event.

Any ideas?