knvs, does your drivers side mirror still dim? I have seen a few MBs with a yellow tint...and it appears the photochromatic material either fails, or breaks down. Not sure if this is even how it works. But when I initially bought my car I asked a few people form mercedesshop and others confirmed the mirror has gone bad and needed to be replaced. It seems a "failing" autodim mirror will start turning this yellow color.

When I proved to the dealer the mirror was bad, I had it replaced and the new glass worked fine.

btw- I don't know how much the w202 autodimming drivers side glass cost, but when my w210 aspherical autodim glass broke off and fell (don't know how), I found it cost a whopping $500+ just for this glass!!! What a freakin' rip! Since this was coming out of my pocket, I was able to find an extra and avoid that cost!