I think this might help you out. I hope so
Remove the grey upper engine cover, standing in front of the car, you will look over the top of the engine and see fuel rails that go across the top of the engine. The sensor is located at the back of the engine just next to the fuel rails. Its a black, rectangular device that is about an inch and quarter by three inches. There is a 4 wire connector and a vacuum line going to this unit. Be careful removing the vacuum line and connector, they become brittle. If you replace the sensor, also replace the vacuum line going to it with the proper size and distance.
1994 SSEi Fire Red New License plates soon BURNT 94