Where is the engine control unit located on a 1999 Pontiac grand am 4 cylinder engine?

The engine control unit (ECU) on a 1999 Pontiac Grand Am with a 4-cylinder engine is located in the engine compartment on the passenger side of the vehicle, near the firewall. It is usually mounted on a bracket or tucked away behind other components, such as the air filter housing or battery. To access it, you may have to remove some covers or shields to gain clear visibility and reach. Look for a small metal or plastic box with multiple electrical connectors attached to it.