Where is engine coolant temperature sensor P0118 located on 1996 Impala SS LT 1 engine?

The P0118 code (Engine Coolant Temperature Sensor (ECT) Circuit High Input) on a 1996 Impala SS LT1 refers to a sensor problem, not necessarily a bad sensor location. However, the sensor itself is located on the engine block, near the thermostat housing.

It's a small, one-wire sensor, usually with a single-wire connector. It's important to distinguish it from other temperature sensors that might be nearby. Consult a repair manual or a wiring diagram specific to your 1996 Impala SS LT1 for precise placement and connector identification. A visual inspection, using the diagram as a reference, is best for pinpoint accuracy.