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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSFUEL SYSTEM - MIL ON/MULTIPLE FUEL TRIM DTC'S SET
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Fuel System - MIL ON/Multiple Fuel Trim DTC's Set
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Fuel System - MIL ON/Multiple Fuel Trim DTC's Set
01 08 13
2009931/3
November 24, 2008.
Supersedes Technical Service Bulletin Group 01 number 05-04 dated June 9, 2005 for reasons listed below.
Affected Vehicles
24 Long Term Fuel Trim - System Too Rich
Condition
From 01-05-04, June 9, 2005
Long Term Fuel Trim - System Too Rich
Technical Background
One of the Diagnostic Trouble Codes (DTCs) shown above is stored in the Engine Control Module. These codes may be accompanied by an Malfunction Indicator Light (MIL) -K83- illumination.
This condition may be also due to a clogged Suction Jet Pump.
Production Solution
N/A
Service
In addition to other diagnosis for these DTCs (Refer to Repair Manual for a Rich Fuel Trim or Guided Fault Finding) also check if suction jet pump is clogged as follows:
- Remove 2 hoses from suction jet pump -black arrows-.
- Blow air through side port -white arrow-.
- If air exhausts through lower port:
TIP:
Suction jet pump is not clogged. Continue with diagnosis.
- If air does not exhaust through lower port:
TIP:
Suction jet pump is clogged. Replace suction jet pump.
2009931/3
November 24, 2008.
Supersedes Technical Service Bulletin Group 01 number 05-04 dated June 9, 2005 for reasons listed below.
Affected Vehicles
24 Long Term Fuel Trim - System Too Rich
Condition
From 01-05-04, June 9, 2005
Long Term Fuel Trim - System Too Rich
Technical Background
One of the Diagnostic Trouble Codes (DTCs) shown above is stored in the Engine Control Module. These codes may be accompanied by an Malfunction Indicator Light (MIL) -K83- illumination.
This condition may be also due to a clogged Suction Jet Pump.
Production Solution
N/A
Service
In addition to other diagnosis for these DTCs (Refer to Repair Manual for a Rich Fuel Trim or Guided Fault Finding) also check if suction jet pump is clogged as follows:
- Remove 2 hoses from suction jet pump -black arrows-.
- Blow air through side port -white arrow-.
- If air exhausts through lower port:
TIP:
Suction jet pump is not clogged. Continue with diagnosis.
- If air does not exhaust through lower port:
TIP:
Suction jet pump is clogged. Replace suction jet pump.
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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.