Relax Moe, the environmentalists are the ones that created P044x codes, not the car makers. The same people that created the PCV way back when all sorts of pollutants were created by the IC engine. The gasoline evap system is the reason you should never smell gasoline in your closed garage.

I realize there could be two warning lights, or even a bunch, to distinguish between a real engine problem and other problems not engine performance related. But, then no one would get their 'other' light turned off because it does not affect drivability; similar to the service light. I had a 1992 Mazda MPV that turned on the CEL at 80,000 miles... to get me to a dealer so the emission controls could be inspected and charge me $250 to turn the light off for another 80K miles. Needless to say, the mechanical tripper on the odometer was removed by me.

Use some TB cleaner and try cleaning out the SAS valve and see if that makes a difference.

Klaus

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Proud owner of a 220S. If I had more room, I would have more Volvos.