I discovered mine when I was installing my ram air intake (good investment; +++MPG and power). Anyways, It's in the bottom half of your stock air box. It's located behind the drivers side headlight in the engine bay with a tube going into the intake manifold.
In the bottom half of the airbox.
It means that the engine computer has detected a malfunction that will affect the emissions of the vehicle.
With an automotive computer or they'll do it for free at any AutoZone or PepBoys, or any automotive store.
What size engine.
i have the 3.4 liter 2000 impala and its up against the top of the firewall towards the middle of the engine
It is behind the grill and in front of the engine.
It is on the very bottom of the engine on the oil pan.
Either a 3.4 or 3.8 V6
front of engine neat oil filter
At the engine end of the top radiator hose.
The check engine light problem will have to be repaired in order to have someone with a scanner to reset it. If the repair is not made then the light will come back on immediately.
It has no governor. Speed is computer controlled.