I noticed my readings were a bit high, so I inspected the air sensor and found the filter was dirty. It rests inside the basket for the thermo/hygro board. You pinch off the bottom of the radiation shield to get to it. Then you pop off the sensor tabs to release the housing. From there, you disconnect the wires, take a very small phillips screwdriver and take out the two screws to get to where the filter is inside. You take out one plastic air shield. Take careful notice of how you remove this section because it has to go back in the same way. IF the filter is blocked, that will not allow good flow over the sensor.
