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Oil Pressure Sensor Replacement
 
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Pelican Technical Article:

Oil Pressure Sensor Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$50

Talent:

***

Tools:

25mm socket, flathead screwdriver

Applicable Models:

Volvo V70 (2002-06)

Parts Required:

Oil pressure sensor

Hot Tip:

Work with a cool engine

Performance Gain:

Remedy oil pressure light

Complementary Modification:

Replace engine oil

The oil pressure sensor (switch) is located on the front of the engine crankcase below the intake manifold. It consists of a switch, which closes when oil pressure in the engine falls below 5.8-8.6 psi. When this circuit is closed an output in the instrument cluster is grounded and the warning lamp is illuminated.

When an oil pressure sensor fails, the engine oil pressure light will illuminate or not come on with the key on and engine off. I have seen low engine oil pressure cause similar problems to a sensor, so be sure to test engine oil pressure if you suspect it may be low, especially if you have a flickering oil pressure light.

Oil Pressure Specification

800 rpm - 0.10 MPa (14 psi)

4000 rpm - min 0.35 MPa (49.8 psi), max 0.70 MPa (100 psi). Max Oil Pressure -0.60 MPa (85.3 psi)

NOTE: Oil pressures apply at an oil temperature of 100°C , which is reached after 10-15 minutes driving.

In this article, I'll go over the steps involved with replacing the oil pressure sensor.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

On V70 base models, the oil pressure sensor (red arrow) is located in the crankcase next to the starter motor (green arrow).
Figure 1

On V70 base models, the oil pressure sensor (red arrow) is located in the crankcase next to the starter motor (green arrow).

With the key on and engine off, the oil pressure light (green arrow) should be ON.
Figure 2

With the key on and engine off, the oil pressure light (green arrow) should be ON. If it is not (red arrow), the sensor wiring (circuit) may be open. When you start the engine, the light should go out and stay out after a few seconds.

Disconnect the electrical connector by squeezing the connector (red arrows) and pulling it straight off.
Figure 3

Disconnect the electrical connector by squeezing the connector (red arrows) and pulling it straight off.

Then, clean any debris off the old sensor (red arrow).
Figure 4

Then, clean any debris off the old sensor (red arrow).

Using a 25mm socket, loosen the sensor (red arrow).
Figure 5

Using a 25mm socket, loosen the sensor (red arrow).

Once loose, remove the sensor by unscrewing it.
Figure 6

Once loose, remove the sensor by unscrewing it. Be sure the washer (red arrow) does not remain on the crankcase. Replace the sealing washer with a new one.

Remove any debris from the sensor-sealing surface (red arrow).
Figure 7

Remove any debris from the sensor-sealing surface (red arrow). If you need to test oil pressure, install your gauge here. Reverse these steps to install the new sensor.

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