Oil pressure sensor (Honda Accord 3)

The oil pressure sensor is a relay switch controlled by the oil pressure in the lubrication system. Under normal conditions, the switch is open by high oil pressure. If the pressure drops below an acceptable level, the switch closes, turning on the oil pressure warning light on the instrument cluster. In many cases, feedback is provided by the onboard computer ECU or integrated control unit. When one of these devices receives a low pressure signal, it takes compensatory action, such as turning off the fuel pump relay. By shutting down the engine, the system tries to protect itself from more serious damage caused by lack of lubrication.

The oil pressure sensor is located above or near the base of the oil filter. On 1984-89 ACCORD and 1984-87 PRELUDE vehicles, the sensor is screwed into the base of the oil filter. On 1990-91 ACCORD and 1988-91 PRELUDE vehicles, the sensor is screwed into the wall of the engine compartment just behind the head of the engine, located above the filter.

The oil pressure switch is usually triggered by a very low oil level. If the warning light comes on while the vehicle is moving, turn off the engine IMMEDIATELY! DO NOT assume that the oil level is simply low, such a sudden drop in pressure is usually associated with mechanical damage to the engine.

To remove the sensor, make sure the ignition is off, then disconnect the wire from the sensor. Disconnect the sensor with a spanner of the appropriate size, as the threads are covered with sealant and the sensor is difficult to turn. Be careful not to damage the threads and sealant.



When installing the sensor, coat the threads with non-hardening sealing grease or compound. Install the sensor, tightening it to 18 Nm. Connect the wire to the sensor or to the harness. Double-check the oil level with a dipstick to prevent leakage during repairs.

If there is a need for constant monitoring of the oil pressure in the engine, then the pressure gauge should be connected instead of the removed sensor.