1996 Grand Cherokee Replace the Oil Sending Unit
Located on the passenger's side of the engine block, the oil pressure sensor in your 1996 Jeep Grand Cherokee converts engine oil pressure to milliamps and sends this information to the engine management computer. Whether your Jeep has a 4.0-liter inline six cylinder or a 5.2-liter v-8, the sensor sits in nearly the same place on the engine block. Sensor failures can exhibit as erratic readings at the oil pressure gauge on the instrument panel or a low pressure indicator light flashing on and off randomly. You can replace the sensor in minutes, and a new sensor is available from Jeep or through a parts store.
 Tools Used
 Replace the Oil Sending Unit
- Open the hood of your Jeep and locate the negative battery cable end at the battery. Loosen the clamp bolt on the cable end with a wrench then separate the cable from the battery terminal. Isolate the cable end away from the battery while you work.
- Locate the oil pressure sensor on the passenger side of the engine, near the oil filter housing. The sensor threads into the engine block and has an electrical connector on the top of it with a single wire coming off it.
- Release the locking tab on the electrical connector then pull the connector off the sensor and lay it aside. Slide a deep socket over the sensor, connect a ratchet to it and rotate the sensor counterclockwise until it is free of the engine block. Discard the old sensor.
- Position the new sensor in the engine block, rotating it clockwise by hand until it is snug. Place the socket and ratchet on the sensor then carefully turn it another 1/4-turn to secure it.
- Push the electrical connector on to the new sensor until the locking tab engages. Move back to the battery and position the negative battery cable end onto the battery terminal. Tighten the clamp bolt with a wrench then close the hood.