BMW Cars 1999-06

Oil Pressure Sensor

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Removal & Installation




WARNING
Only perform this task on an engine that has cooled down.

E30 Models
  1. Disconnect the negative battery cable
  2.  
  3. If the tank is full, remove some fuel to lower the level.
  4.  
  5. Remove the rear seat cushion and peel back the insulating sheet to access both covers.
  6.  
  7. Remove the screws from the covers and lift off. Pull of the electrical plug and disconnect the fuel lines. Catch any spilled fuel.
  8.  
  9. If equipped with a level sender held by 4 screws, remove the 4 screws from the sender portion of pickup assembly on the right side. Slowly remove the sender to allow the fuel to drain into the tank. If there are no screws, rotate the assembly counterclockwise and remove.
  10.  
  11. Rotate the left side sender assembly counterclockwise and pull out slowly. Allow the fuel to drain back into the tank.
  12.  

To install:

  1. Replace the gasket and lower the left side sender assembly into the fuel tank. Rotate the assembly clockwise to lock into place.
  2.  
  3. Replace the gasket and lower the fuel level sender into the pickup assembly, if equipped. Replace the screws.
  4.  
  5. Connect the fuel lines and electrical connector. Replace the covers and the insulating sheet. Install the rear seat cushion.
  6.  
  7. Fill the fuel tank with at least 1 1 / 2 gallons (5.6 l) of fuel.
  8.  
  9. Reconnect the negative battery cable and check for normal operation and fluid leaks and repair as necessary.
  10.  

E36 Models Except Z3
Left Side
  1. Disconnect the negative battery cable
  2.  
  3. Drain the fuel from the fuel tank if the level is high. It is best to do this procedure with little fuel in the tank.
  4.  
  5. Remove the rear seat cushion and pull off the cover on the left side to expose the top of the fuel pickup assembly.
  6.  
  7. Disconnect the plugs on the top of the assembly.
  8.  
  9. Mark and disconnect the fuel lines. Using tool 16 1 020 or equivalent, rotate the mounting ring and remove the assembly. Press the level arm in slightly to make clearance when removing.
  10.  



Click image to see an enlarged view

Fig. Left side fuel level sender components-E36 3 Series

To install:


NOTE
The entire unit must be replaced. The individual parts are not serviceable.

  1. Using a new seal and mounting ring, install the assembly. Insert the fuel pickup and float into the tank. Press the center rod upwards and in the direction of the pickup. Release the rod so it sits in the depression on the bottom of the tank. There is a rib on the flange that should align with a mark on the fuel tank.
  2.  
  3. Using Tool No. 16 1 020 or equivalent, torque the mounting ring to 27-31 ft. lbs. (37-43 Nm).
  4.  
  5. Connect the fuel lines and the electrical connector. Install the cover and rear seat.
  6.  
  7. Fill the fuel tank with at least 1 1 / 2 gallons (5.6 l) of fuel.
  8.  
  9. Reconnect the negative battery cable and check for normal operation and fluid leaks and repair as necessary.
  10.  

Right Side
  1. Disconnect the negative battery cable
  2.  
  3. Drain the fuel from the fuel tank if the level is high. It is best to do this procedure with little fuel in the tank.
  4.  
  5. Remove the rear seat cushion and pull off the cover on the right side to expose the top of the fuel pickup assembly.
  6.  
  7. Disconnect the plugs on the top of the assembly. The black connector is for the fuel pump. The white connector is for the fuel level sender.
  8.  
  9. Mark and disconnect the fuel lines. Using tool 16 1 020 or equivalent, rotate the mounting ring and remove the assembly. Press the level arm in slightly to make clearance when removing.
  10.  



Click image to see an enlarged view

Fig. Right side fuel level sender components-E36 3 Series

To install:


NOTE
The entire unit must be replaced. The individual parts are not serviceable.

  1. Using a new seal and mounting ring, install the assembly. Move the unit from side to side to make sure the level sender is free and in the correct location. There is a rib on the flange that should align with a mark on the fuel tank.
  2.  
  3. Using Tool No. 16 1 020 or equivalent, torque the mounting ring to 27-31 ft. lbs. (37-43 Nm).
  4.  
  5. Connect the fuel lines and the electrical connectors. Install the cover and rear seat.
  6.  
  7. Fill the fuel tank with at least 1 1 / 2 gallons (5.6 l) of fuel.
  8.  
  9. Reconnect the negative battery cable and check for normal operation and fluid leaks and repair as necessary.
  10.  

E46 Models
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Set the ignition switch to the OFF position.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Remove suction filter housing.
  8.  
  9. Unfasten oil filter cover to enable engine oil in filter to flow back into the oil sump.
  10.  
  11. Disconnect plug connection. Remove oil pressure sensor.
  12.  
  13. To install, reverse removal procedure.
  14.  

E60 & E65 Models

NOTE
On E60 models, oil pressure sensor is located at base oil filter housing. On E65 models oil pressure sensor is located at cylinder bank 1 to 4 on cylinder head, front right.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Set the ignition switch to the OFF position.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Remove intake filter housing.
  8.  
  9. Disconnect electrical connector and unscrew oil pressure sensor.
  10.  
  11. To install, reverse removal procedure.
  12.  

E85 Models

NOTE
Oil pressure sensor is located on oil filter housing, front left.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Set the ignition switch to the OFF position.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Remove ignition coil cover.
  8.  
  9. Remove intake filter housing.
  10.  
  11. Disconnect electrical connector and remove oil pressure sensor.
  12.  
  13. To install, reverse removal procedure.
  14.  

Testing



  1. Remove the fuel level sensor as outlined in this section.
  2.  
  3. Temporarily reconnect the electrical connectors for the fuel level sensor.
  4.  
  5. Turn the ignition switch to the ON position, but DO NOT attempt to start the engine.
  6.  
  7. Move the sensor float up and down while observing the fuel level gauge. The gauge should move as the float is moved.
  8.  


NOTE
The reserve contact is operational when the fuel volume is less than or equal to 1.7 gallons (6.5 L).

On E36 models, the actual float resistance can be checked using an ohmmeter.

Sensor resistance for E36 models produced before January 1995:



Left sensor, full tank: 245-255 ohms
 
Left sensor, empty tank: 8-12 ohms
 
Right sensor, full tank: 245-255 ohms
 
Right sensor, empty tank: 8-12 ohms
 

Sensor resistance for E36 models except Z-3 produced after January 1995:



Left sensor, full tank: 235-244 ohms
 
Left sensor, empty tank: 8-12 ohms
 
Right sensor, full tank: 255-266 ohms
 
Right sensor, empty tank: 8-12 ohms
 

Sensor resistance for Z-3 models:



Full tank: 480-520 ohms
 
Empty tank: 16-24 ohms
 

 
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