Drawing item #4 ($230) is the "assembly" which includes the MAFIt does not appear that it is an separate, replaceable item. It is shown in the Toyota Parts catalog as part of the Air Intake / Upper Cover. The part number is 177050V120 and the list price is $317.60. Think that price also includes the Air Mass sensor. My guess is that is does not / should not need any attention during the normal life of the vehicle. The replaceable air filter is before this item and should prevent it from getting dirty or damaged. I have not removed or disturbed it during replacement of the air filter.
2014 Toyota RAV4 Parts - Camelback Toyota Parts - Genuine OEM Parts - Free Shipping