What year is your car?

I had a problem with a loaner when Volvo first added the monitor to the gas cap and I was told that the dealer had to reset it and not to worry, just remind them when I brought the car back.

I checked the gas cap and it was loose.

They told me that the new light trigger was a big pain in the butt.

By the way - buying a code reader will not help you if you do have a loose hose in the system.

You might try posting a better description of your problem by mentioning the code number in the title.

Klausc might jump in on it.