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Oil Pressure Sensor Replacement
 
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Pelican Technical Article:

Oil Pressure Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$35 to $100

Talent:

**

Tools:

24mm, (2) 13mm, 7mm wrenches, 10mm deep socket bucket and rags, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Sensor and crush washer

Hot Tip:

Be prepared for oil to spill out

Performance Gain:

Proper pressure sensing

Complementary Modification:

Oil and filter change

If your oil pressure gauge is starting to act up or quit working completely, there is a very good chance that your oil pressure sensor is starting to go or has gone bad. Changing the sensor out is not difficult, but if you are performing the work on a vehicle with an additional oil cooler you will want to move the power steering pump out of the way to give you room to work. You do not want to disconnect the lines on the pump. Just remove it from the mount and let it hang by the lines out of the way.

Even if you have drained the oil to perform an oil and filter change while doing this job, there still will be oil that flows from the sensor opening. Be prepared to catch it and dispose of it in accordance with your local regulations.

You will be working under the vehicle so you will need to safely raise and support it. Please see our article on safely jacking up and supporting your Porsche 944.

With the vehicle safely raised and supported remove the under engine tray (red arrow).
Figure 1

With the vehicle safely raised and supported remove the under engine tray (red arrow). Please see our article on under tray removal for additional assistance.

On the power steering pump, begin by loosening the 13mm bolt on the top of the power steering mount (red arrow, hidden behind the pulley).
Figure 2

On the power steering pump, begin by loosening the 13mm bolt on the top of the power steering mount (red arrow, hidden behind the pulley). Then make sure the turnbuckle is clean and free of grease and oil (yellow arrow).

Use two 13mm wrenches and separate the double nuts on each end of the turnbuckle (red and yellow arrows).
Figure 3

Use two 13mm wrenches and separate the double nuts on each end of the turnbuckle (red and yellow arrows).

With the nuts loose use the 13mm wrench and turn the turnbuckle so that it loosens tension on the belt (red arrow).
Figure 4

With the nuts loose use the 13mm wrench and turn the turnbuckle so that it loosens tension on the belt (red arrow).

Use a 13mm wrench or socket and remove the mounting bolt on the pump (red arrow).
Figure 5

Use a 13mm wrench or socket and remove the mounting bolt on the pump (red arrow).

With the turnbuckle free you can move the pump towards the center of the engine (red arrow) and remove the belt.
Figure 6

With the turnbuckle free you can move the pump towards the center of the engine (red arrow) and remove the belt.

Now completely remove the 13mm nut on the front of the pump (red arrow) and the 13mm bolt on the rear (yellow arrow).
Figure 7

Now completely remove the 13mm nut on the front of the pump (red arrow) and the 13mm bolt on the rear (yellow arrow). Pull the bolt from the rear and then slip the pump from the sleeve on the front.

Let the pump hang by the lines out of the way.
Figure 8

Let the pump hang by the lines out of the way. Doing so will permit access to the oil pressure sensor (red arrow).

Remove the protective caps on the wiring connections and separate the connections (red arrows).
Figure 9

Remove the protective caps on the wiring connections and separate the connections (red arrows). These may vary, as one of ours was held in place with a 7mm nut and the other was a spade connector.

On the underside of the frame rail is a connection that holds the wiring for the brake sensor and the power steering cooling line (red arrow).
Figure 10

On the underside of the frame rail is a connection that holds the wiring for the brake sensor and the power steering cooling line (red arrow). If you cannot spin the sensor off because the line is in the way, pull the electrical wire off and then use a 10mm deep socket and remove the mount for the power steering cooling and set the line aside.

Use a 24mm open-ended wrench and break loose the sensor from the mount (red arrow).
Figure 11

Use a 24mm open-ended wrench and break loose the sensor from the mount (red arrow). You can spin the sensor out from the mount by hand once it is loose. Oil is going to spill out so be prepared for it. If you are quick on installing the new one you will keep the oil mess to a minimum.

Make sure that the new sensor has a new crush washer on it (red arrow).
Figure 12

Make sure that the new sensor has a new crush washer on it (red arrow).

It is a good idea to check the condition of the mount and clean the area around it while you have the sensor off (red arrow).
Figure 13

It is a good idea to check the condition of the mount and clean the area around it while you have the sensor off (red arrow). Just be prepared for some oil to spill out. Installation is the reverse of removal.

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