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 MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMLOCATIONSENGINE COMPARTMENT VIEW
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Engine Compartment View
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Engine Compartment View
MULTIPORT FUEL INJECTION AND IGNITION SYSTEM
Engine Control Module (ECM)
• Not shown
• Located in passenger-side foot- well, in electronics box under carpeting
Components 1 thru 7
1 Harness connectors:
A For Oxygen Sensor # 1 heater
• Heater for heated oxygen sensor # 1, right bank
• Black 2-pin connector
B For Ignition coils
• Battery positive voltage (B+) supply
• White connector
C For Heated Oxygen Sensor (HO2S)
• Signal wire
• Under connector holder on bulkhead
D For Knock Sensor (KS) # 1
• Blue connector
E For Engine Speed (RPM) sensor
• Gray connector
F For Crankshaft Position (CKP) sensor
• Black connector
2 Power output stage
• For ignition coils
A Signal wires
• From Engine Control Module (ECM)
• Brown 4-pin connector
B Ignition coil primary circuit connections
3 Throttle Position (TP) sensor
• With integrated Closed Throttle Position (CTP) switch
4 Harness connectors:
A For Heated Oxygen Sensor (HO2S) # 2
• Signal wire
B For Oxygen Sensor # 2 heater
• Heater for heated oxygen sensor # 2, left bank
• Black 2-pin connector
C For Knock Sensor (KS) # 2
• Blue connector
5 EGR valve and temperature sensor
• US vehicles only
6 Camshaft Position (CMP) sensor
7 Data Link Connector (DLC)
Components 8 thru 14
8 Engine Coolant Temperature (ECT) sensor
• In coolant line behind cylinder head
9 Heated Oxygen Sensor (HO2S) # 2
10 Engine Speed (RPM) sensor
11 Knock Sensor (KS) # 2
12 Crankshaft Position (CKP) sensor
• Reference mark on left-hand side of cylinder block
13 Fuel Injectors
14 Ignition coils
• Ignition coil # 1
• Ignition coil # 2
• Ignition coil # 3
Components 15 thru 23
15 Ground (GND) connection
• On intake manifold
16 Idle Air Control (IAC) valve
17 Fuel pressure regulator
18 Heated Oxygen Sensor (HO2S)
19 A EGR vacuum regulator solenoid valve
19 B Intake manifold change-over valve
20 EVAP canister purge regulator valve
21 Mass Air Flow (MAF) sensor
22 Knock Sensor (KS) # 1
23 Ground (GND) connection
• On right engine mount
Engine Control Module (ECM)
• Not shown
• Located in passenger-side foot- well, in electronics box under carpeting
Connector / Component Locations:
Components 1 thru 7
1 Harness connectors:
A For Oxygen Sensor # 1 heater
• Heater for heated oxygen sensor # 1, right bank
• Black 2-pin connector
B For Ignition coils
• Battery positive voltage (B+) supply
• White connector
C For Heated Oxygen Sensor (HO2S)
• Signal wire
• Under connector holder on bulkhead
D For Knock Sensor (KS) # 1
• Blue connector
E For Engine Speed (RPM) sensor
• Gray connector
F For Crankshaft Position (CKP) sensor
• Black connector
2 Power output stage
• For ignition coils
A Signal wires
• From Engine Control Module (ECM)
• Brown 4-pin connector
B Ignition coil primary circuit connections
3 Throttle Position (TP) sensor
• With integrated Closed Throttle Position (CTP) switch
4 Harness connectors:
A For Heated Oxygen Sensor (HO2S) # 2
• Signal wire
B For Oxygen Sensor # 2 heater
• Heater for heated oxygen sensor # 2, left bank
• Black 2-pin connector
C For Knock Sensor (KS) # 2
• Blue connector
5 EGR valve and temperature sensor
• US vehicles only
6 Camshaft Position (CMP) sensor
7 Data Link Connector (DLC)
Connector / Component Locations:
Components 8 thru 14
8 Engine Coolant Temperature (ECT) sensor
• In coolant line behind cylinder head
9 Heated Oxygen Sensor (HO2S) # 2
10 Engine Speed (RPM) sensor
11 Knock Sensor (KS) # 2
12 Crankshaft Position (CKP) sensor
• Reference mark on left-hand side of cylinder block
13 Fuel Injectors
14 Ignition coils
• Ignition coil # 1
• Ignition coil # 2
• Ignition coil # 3
Connector / Component Locations:
Components 15 thru 23
15 Ground (GND) connection
• On intake manifold
16 Idle Air Control (IAC) valve
17 Fuel pressure regulator
18 Heated Oxygen Sensor (HO2S)
19 A EGR vacuum regulator solenoid valve
19 B Intake manifold change-over valve
20 EVAP canister purge regulator valve
21 Mass Air Flow (MAF) sensor
22 Knock Sensor (KS) # 1
23 Ground (GND) connection
• On right engine mount
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
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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.