What is meaning of A126 in 2008 acura RDX - 2007 Acura MDX

It is a know issue Melissa and Victoria. Try the Reboot / Reset.

https://www.google.com/search?q=2019+Acura+RDX.+Acura+Infotainment+system+is+fading+in+and+out...and+then+the+message+Drive+mode+change+unavailable

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I found the spring for the latch at https://productworldusa.com/search?q=rdx

Behind the glove box be sure the new filter is replaced arrows down its directional there is a you tube video showing the process

What kind of code do you mean?

You will have to call a Acura dealer for that information

Have to Google any codes you get

ACURA OBD P1009

What are the things to be done in a B1 service for RDX2011

you have to have it reset after every oil change.

You can check this website, you find there fuse box diagram and description for Acura RDX (2006 - 2008)

Acura RDX 2006 2008 fuse box diagram Auto Genius

in the black box behind the battery