Hi Frank,

Have you solved the problem? How? I've got the same code for my Vovlo S40 2000.
I had CEL come on last year about the same time, in January, when we got cold weather. I had not read the ODBII code that time, but taking a friend's advice filled the tank with high grade fuel and drove on highway, this cleaned off the CEL.
This time I have got the code read in Autozone (they do it free). My temperature gauge indicates normal temperature, and coolant is up to normal level. Besides, I had the car inspected and serviced by the dealer around Thanksgiving without any problem on the thermostat/coolant side. They claimed that, by my request, have checked the car for winter season.

I'll greately appreciate if you tell me how your story ended: what did you learned, what was the real cause(OBDII codes do not indicate directly what part is bad in particular), and what was the solution?

Thank you