I am not a mechanic

... nor do I play one on TV.

I'd only had the Ask the Danimal box on this blog for a day, and I was notified that someone asked this question:

What causes the vehicle to fail an ASM vehicle emissions test?

My first thought was... Why do I care? I later decided that I could at least try to find out something. I was curious to find out what ASM stood for. So I did.

What? I'm not going to reproduce the answer for you here. ;P You ask the question yourself.