A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
Oxygen Sensor: Locations
Motronic Fuel Injection System Component Locations, Overview
NOTE: Component location without illustration:
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Leak Detection Pump (LDP) -V144-
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Behind rear left wheelhousing liner
1
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Evaporative Emission (EVAP) canister purge regulator valve -N80-
2
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Heated Oxygen Sensor (HO2S) -G39- before catalytic converter, 55 Nm
-
Continuous oxygen sensor
3
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Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) -G130-, 55Nm
4
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Combination - valve for secondary air injection (AIR)
5
-
Engine - Coolant Temperature (ECT) sensor -G62-
6
-
Fuel pressure regulator
7
-
Engine Speed (RPM) sensor -G28-
8
-
Secondary Air Injection (AIR) solenoid -N112-
-
See Fig.4
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Green harness connector
9
-
Bracket for harness connectors
-
See Fig.1
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Accessible with coolant expansion tank unbolted and swung to the side.