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Home >> Audi >> 2009 >> Q7 4.2 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (3.0L - Exhaust System & Emission Controls - Engine Code: CATA) >> 26 Exhaust System, Emission Controls >> Exhaust Temperature Regulation >> Exhaust Temperature Control Overview

Exhaust Temperature Control Overview

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Fig 1: Exhaust System Overview
GWWA26-10662Courtesy of AUDI OF AMERICA, LLC
  1. SCR Catalytic Converter
  2. Exhaust Gas Temperature Sensor 4 -G648-
  3. Particulate Filter
  4. Primary Catalytic Converter
  5. Exhaust Gas Temperature Sensor 3 -G495-
  6. Catalyst Temperature Sensor 1 -G20-
  7. Exhaust Gas Temperature Sensor 2 -G448-
  8. Nut
  9. NOx Sensor -G295-
  10. Heated Oxygen Sensor -G39- with Oxygen Sensor Heater -Z19-
  11. Turbocharger
  12. Exhaust Gas Temperature Sensor 1 -G235-
  13. Differential Pressure Sensor -G505-
  14. Nut
  15. Pressure Line for the Differential Pressure Sensor -G505-
    • Tightening specification: 23 Nm
    • Clip to the particulate filter.
    • Secure with standard production clamps .
  16. NOx Sensor 2 -G687-
  17. Nut