Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTLOCATIONS
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Powertrain Management: Locations
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Locations
1. Power output stage -N122- and power output stage 2 -N192-
2. Engine Control Module (ECM) -J220-
3. Fuses and relays
- Fuses for Motronic
- Motronic Engine Control Module (ECM) power supply relay -J271-
4. Harness connector Connector for:
- Heated Oxygen Sensor (HO2S) -G39-
- Oxygen Sensor (O2S) heater -Z19-
- Bank 1
O2S Harness Connector, Bank 1:
NOTE: The connector for bank 1 Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) -G130- and O2S heater -Z29- is located under the right front carpet
5. Heated Oxygen Sensors (HO2S), Oxygen Sensor (O2S) heaters (bank 1)
- HO2S -G39-
- O2S heater -Z19-
- O2S behind TWC -G130-
- O2S heater -Z29-
6. Engine Coolant Temperature (ECT) sensor -G62-
- Rear of cylinder head
7. Intake Air Temperature (IAT) sensor -G42-
8. Throttle Position (TP) sensor -G69-
- With integrated Closed Throttle Position (CTP) switch -F60-
9. Idle Air Control (IAC) valve -N71-
10. Engine Speed (RPM) sensor -G28-
11. Harness connector
Connector for:
- Heated Oxygen Sensor (HO2S) 2 -G108-
- Oxygen Sensor (O2S) heater -Z28-
- Bank 2
O2S Harness Connector, Bank 2:
NOTE: The connector for bank 2 Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) 2 -G131- and O2S2 heater -Z30- is located under the right front carpet.
12. Harness connector
- Connector for Engine Speed (RPM) sensor -G28-
13. Heated Oxygen Sensors (HO2S), Oxygen Sensor (O2S) heaters (bank 2)
- HO2S 2 -G108-
- O2S 2 heater -Z28-
- O2S 2 behind TWC -G131-
- O2S 2 heater -Z30-
14. Camshaft Position (CMP) sensor -G40-
15. Knock Sensor (KS) 2 -G66-
16. Ignition coils (bank 2)
- cyl. 5: -N164-
- cyl. 6: -N189-
- cyl. 7: -N190-
- cyl. 8: -N191-
17. Fuel injectors (bank 2)
- cyl. 5: -N83-
- cyl. 6: -N84-
- cyl. 7: -N85-
- cyl. 8: -N86-
18. Air valve for fuel injectors -N212-
19. Intake manifold change-over valve -N156-
20. Knock Sensor (KS) 1 -G61-
21. Fuel injectors (bank 1)
- cyl. 1: -N30-
- cyl. 2: -N31-
- cyl. 3: -N32-
- cyl. 4: -N33-
22. Ignition coils (bank 1)
- cyl. 1: -N-
- cyl. 2: -N 128-
- cyl. 3: -N 158-
- cyl. 4: -N 163-
23. Evaporative Emission (EVAP) canister purge regulator valve -N80-
24. Mass Air Flow (MAF) sensor -G70-
- in Air Cleaner (ACL) housing, upper
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.