My big bitch is that the geniuses they have run the cars on the dyno can't drive. My wife's 1995 Rodeo has always passed with flying colors. This last time, some millennial yokel that couldn't drive a manual managed to get it to fail because they couldn't keep up with the bouncing arrow on the display, and kept having to stomp on the accelerator. Fortunately, their extremely low level of competence extended to their typing as well, as they managed to get the license plate in the computer wrong. When I noticed the error (vanity plate, so it was glaringly obvious), I specifically requested that the vehicle be tested by someone that could drive a stick shift. Miraculously, the vehicle that had just failed miserably (high CO) now passed with emissions well within the limits. As a bonus, this drama took an hour and a half to play out, so I missed about an hour of work. I had a similar issue with my MR2 a few years back at a different station. Different driver, dramatically different result.