The "Check Engine" light is also called the "Idiot Light", which basically says, "we know you are pretty useless, so bring the car to one of our dealers who will charge you $150 per hour to fiddle around with it."
I once had a camaro with such a light. The Catalytic converter was getting old and needed to be replaced, so I replaced it with a straight pipe instead (got better power and better consuption for less money). Of course the idiot light stayed on all the time, because of the different back pressure etc, so I ended up removing the bulb, and the car ran trouble-free for years.
The only thing you should feel when shooting a terrorist: Recoil.