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Home >> Audi >> 2009 >> Q7 4.2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (3.0L - Diesel Fuel Injection - Engine Code: CNRB) >> 23 Diesel Fuel Injection >> Description And Operation >> Heated Oxygen Sensor Overview

Heated Oxygen Sensor Overview

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Fig 1: Exhaust Components Location
GWWA26-11366Courtesy of AUDI OF AMERICA, LLC
  1. Nut
    • 3.5 Nm
  2. Particulate Sensor -G784-
  3. SCR - Catalytic Converter
    • SCR means: Selective Catalytic Reduction
  4. Exhaust Gas Temperature Sensor 4 -G648-
  5. Particulate Filter
  6. Primary Catalytic Converter
  7. Exhaust Gas Temperature Sensor 3 -G495-
  8. Exhaust Gas Temperature Sensor 2 -G448-
  9. NOx Sensor Control Module -J583- with NOx Sensor -G295-
  10. Nut
    • 2.5 Nm
  11. Heated Oxygen Sensor -G39- with Oxygen Sensor Heater -Z19-
    • 50 Nm
    • Coat new oxygen sensors with an assembly paste
    • On a used heated oxygen sensor, only the thread may be coated with hot bolt paste; Hot Bolt Paste.
    • Assembly paste or hot bolt paste must not get into the slits on the oxygen sensor body.
    • Removing and installing, refer to Heated Oxygen Sensor -G39- WITH Oxygen Sensor Heater -Z19- 
  12. Turbocharger
  13. Exhaust Gas Temperature Sensor 1 -G235-
  14. Differential Pressure Sensor -G505-
    • Pressure line to particulate filter 45 Nm
    • With two pressure pipes
    • Removing and installing, refer to Differential Pressure Sensor -G505- .
    • After replacing, perform an adaptation
  15. Nut
    • 3.5 Nm
  16. Pressure Lines for the Differential Pressure Sensor -G505-
    • Secure with hose clamps appropriate for the model type
    • Pressure lines on the particulate filter: 45 Nm
  17. NOx Sensor Control Module 2 -J881- with NOx Sensor 2 -G687-
  18. NOx sensor 2 -G687-
    Fig 2: Disconnect Connector -5-
    GWWA26-10745Courtesy of AUDI OF AMERICA, LLC
  19. Removing and installing the Reducing Agent Injector -N474-. Refer to Reducing Agent Injector -N474-, REMOVING AND INSTALLING .