Most people treat an emissions test like a surprise exam. They show up, hope for the best, and then panic if something goes wrong. The smarter move is to treat it like a test you can actually study for, because you can. A few basic checks at home can tell you a lot about how your vehicle will perform before an official e-test in Ontario puts it on the record. Your Dashboard Is Talking, Are You Listening? The first thing to do is sit in your car, turn the key to the "on" position without starting the engine, and watch the dashboard lights. Every warning light should briefly illuminate and then turn off. That's the system doing a self-check. If the check engine light stays on after the engine starts, that's an automatic failure in most emissions tests. It doesn't matter if the car drives perfectly fine. A stored fault code means the system has detected a problem, and inspectors will find it the moment they plug in their scanner. Don't ignore a check engi...