Where is the ecu on a 2003 ford ranger 4.0?
The ECU (Engine Control Unit) on a 2003 Ford Ranger 4.0L is located under the hood, on the driver's side (left side in the US), usually attached to the inner fender well. It's often covered by a plastic shield or cover. It's a fairly large black box. You may need to remove some components to access it fully.
