The car which was used
throughout the
series was a white Volvo P1800... or better several different versions
of this car. Sometimes footage of different models was used in the
same episode! (for example in Episodes #66 "The
Smart Detective" or #68 "The
Man Who Could Not Die")
Actually four cars existed over the course of the series, identified by
their number plate:
71 DXC was bought and restored by Kevin Price. Here's a link to the website dedicated to the restoration of this car.
77 GYL was part
of the collection of the Cars of the Stars (invalid link) museum. The museum was closed in May 2011.
NUV 648E
was also in the collection but was sold in 2005 to fan Bill Krzastek
and meticulously
restored. Read more about the restoration and the transport to the US
on the Volvo 1800 Picture Gallery or an
article about a test drive of the car on MotorTrend. The car is now owned by Volvo Cars.
An article about the car and how the show helped to increase Volvo's sales in general on SouthCoastToday. (on WaybackMachine; original link thanks to www.saint.org)
Finally, two
articles about the car in general on Promotex and Carbuzz.
Here's a test drive from March 2013 by XCAR:
TV show host Jay Leno checks out the NUV 648E car in his "Jay Leno's Garage" show: