Removing Exhaust Temperature Sensors

→ Let hot components cool down.

→ Wear personal protective gear.

Information 

• Both sensors must be removed when carrying out repairs since the electric lines are combined together in one control unit and cannot be separated. 

Information 

Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:

• Torx screws: (E..) for external Torx, (T..) for internal Torx. 
• Hexagon-head bolts (internal and external hexagon): Wrench size (a/f) 

1. Remove control unit -1-  in the engine compartment at the left.
   1. 1.1. Expose electric line for exhaust temperature sensor 1-3 -2-  at the top.
      Fig 1: Identifying Exhaust Temperature Sensor Connectors And Line

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2. Expose electric line for exhaust temperature sensor 4-6 at the top.
   1. 2.1. Unclip line at the engine carrier -arrows-  .
      Fig 2: Locating Engine Carrier Spacer Sleeves And Exhaust Temperature Sensor Line

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   2. 2.2. Unclip line at the bottom of the engine.
      Fig 3: Identifying Line Routing For Exhaust Temperature Sensor 4-6 At Bottom Of Engine

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3. Loosen union nuts for the exhaust temperature sensors and pull these out of the turbocharger.
   1. 3.1. Cylinder bank 1-3: 
      Fig 4: Identifying Exhaust Temperature Sensor, Bank 1-3

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   2. 3.2. Cylinder bank 4-6:  Screw off union nut (M12 x 1, a/f 14) -3-  and unclip the line at the holder -1-  .
      Fig 5: Identifying Oil Return Line From Oil Tank To Turbocharger

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4. Expose electric line for exhaust temperature sensor 1-3 at the engine.

   The retaining clips can be reached easily through the tailpipe opening in the rear apron once the engine is lowered. 

   1. 4.1. Unclip line at the heat shield and at the holder.
      Fig 6: Identifying Exhaust Temperature Sensor Line, Cylinder Bank 1-3

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5. Guide exhaust temperature sensors with lines and connectors (control unit) out of the engine compartment.