AAC Multifunction Sensor

I'm debugging my AC issues... car sat for 4 years.

Also my AAC was reporting weird numbers, it has CO, NOX, air temp, and I believe dew point. All the numbers were weird, so replaced that... the picture shown shows where it is. 

I pulled the grill shown, pulls up, might use a small flat blade screwdriver to release the catches.

Now you can see in this "duct" on the left side,

 also the multi-function sensor ?? I see it described as the multi-function pollution sensor too, 2118300472 ??

looks like it us just behind the positive terminal of the starter battery. AAC KLA