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 MANAGEMENTAPPLICATION AND IDEMISSION SYSTEM APPLICATION CHART
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Emission System Application Chart
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Emission System Application Chart
ENGINE DISPLACEMENT 3.7L (3696cc/226ci)
ENGINE MANAGEMENT SYSTEM MPI MFI with OBD II
ENGINE VIN CODE [1] F
EMISSION CONTROL DEVICES AND SYSTEMS:
CEC Computerized Engine Controls [2]
EVAP Evaporative Emission Control
FR Fill Pipe Restrictor
HO2S Dual Heated Oxygen Sensors, 2 [3]
O2S Dual Heated Oxygen Sensors, 2 (OBD II) [4]
MFI Multiport Fuel Injection
MIL Malfunction Indicator Lamp (CHECK ENGINE)
PCV Positive Crankcase Ventilation
SPK Spark Control
TWC Three-Way Catalytic Converters, 2
[1] 5th digit of Vehicle Identification Number (VIN). VIN plate mounted atop drivers side instrument panel, visible through windshield lower left corner.
[2] Motronic Engine Control, OBD II.
[3] Installed upstream of the catalytic converters and used for fuel mixture control and monitoring.
[4] Installed downstream of the catalytic converters and used to verify proper catalytic converter function.
ENGINE MANAGEMENT SYSTEM MPI MFI with OBD II
ENGINE VIN CODE [1] F
EMISSION CONTROL DEVICES AND SYSTEMS:
CEC Computerized Engine Controls [2]
EVAP Evaporative Emission Control
FR Fill Pipe Restrictor
HO2S Dual Heated Oxygen Sensors, 2 [3]
O2S Dual Heated Oxygen Sensors, 2 (OBD II) [4]
MFI Multiport Fuel Injection
MIL Malfunction Indicator Lamp (CHECK ENGINE)
PCV Positive Crankcase Ventilation
SPK Spark Control
TWC Three-Way Catalytic Converters, 2
[1] 5th digit of Vehicle Identification Number (VIN). VIN plate mounted atop drivers side instrument panel, visible through windshield lower left corner.
[2] Motronic Engine Control, OBD II.
[3] Installed upstream of the catalytic converters and used for fuel mixture control and monitoring.
[4] Installed downstream of the catalytic converters and used to verify proper catalytic converter function.
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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.