Check Engine Light Code PO166?

Alwick · Post by **Alwick** » 19 Feb 2006, 11:31

I was on the highway today and my check engine light came on. It's a '98 V70 GLT with 95k. I've had it for one month. Before I bought it the computer was reset, if that makes a difference.
I took the car back to the dealer, he reset the light and read code PO166, what does this indicate?

White850Turbo · Post by **White850Turbo** » 19 Feb 2006, 12:39

http://www.obdii.com/codes.html

That makes no sense seeing as how these cars only have 2 o2 sensors... then again I'm not terribly familiar with the OBD-II codes. Try to find a Volvo dealer in your area that will pull the Volvo specific codes with the VCT-2000 to trace down the cause.

Alwick · Post by **Alwick** » 21 Feb 2006, 07:56

I'm new to this so I guess I should offer more backround. The light came on on a cold day while the car was still a little cold. I had the heat on but the outside air vents were open.
Could the O2 sensor have responded to the cold?
After the dealer reset the light I've driven about another 30 miles and it hasn't come back on. Do I have anything to be concerned about or should I just keep driving?