2000 2.7T. I got a CEL, and pulled codes 17831 and 17819, Secondary Air Injection system, Insufficient air flow banks 1 and 2. I have 82K on the car. It runs well. Mileage is not affected. I Reset the codes and took a 600 mile trip without the CEL coming back on. Then when I started up this evening, it was on again. I'm figuring it's the MAF. Any advoce out there.