2021 Audi Oil Leak from Cylinder Head TSB 2053278/7

Owners of certain 2021 Audi models equipped with 2.9L or 3.0L TFSI engines may experience an oil leak from the cylinder head area. This issue is addressed by Audi Technical Service Bulletin (TSB) 2053278/7, which supersedes previous bulletin 21-37 dated February 16, 2021. The TSB provides detailed procedures for diagnosing and repairing these leaks, ensuring proper vehicle function and preventing further oil loss. If you notice a 2021 Audi Q8 oil leak, this TSB is highly relevant.

Symptoms of an Oil Leak

Customers may report several indicators of an oil leak from the cylinder head or surrounding components. These include:

• "Oil loss in the area around the engine compartment, front end, and underbody."
• An "Oil level warning (too low)" displayed on the instrument cluster.
• "There is a smell coming from the engine compartment," often due to oil burning on hot engine components.

Workshop technicians examining the vehicle might find specific signs of leakage:

• Oil leaks around the cylinder head cover, valve cover, and the cylinder head itself.
• Leaks in the area around the injector.
• Leaks originating from the Audi valvelift system actuator.

Technical Background

The root cause of these oil leaks has been identified as metal shavings produced during the manufacturing process. These shavings can interfere with the sealing groove between the cylinder head cover and the cylinder head, compromising the seal and leading to oil loss. Audi has implemented improved production processes to prevent this issue in newer vehicles.

Important Warnings

When diagnosing and repairing an oil leak, it is crucial to follow the correct procedure to avoid unnecessary part replacements. The TSB specifically states: "Do not replace the Audi valvelift system actuator(s) with an O-ring seal when the leak has been determined to be around the area of the injector(s)." This warning emphasizes the importance of accurately identifying the leak source before proceeding with repairs.

Diagnosis and Repair Procedure Summary

The repair process outlined in TSB 2053278/7 involves a series of diagnostic steps to pinpoint the exact source of the oil leak, followed by the appropriate repair. The procedure for addressing a 2021 Audi Q8 oil leak includes:

1. Initial Access: Remove the engine compartment cover and the heat shield located beneath it.
2. Noise Insulation Removal: Remove the upper noise insulation from the affected cylinder bank.
3. Audi Valvelift System Actuator Inspection: Carefully remove the Audi valvelift system actuator. If a significant amount of oil is found beneath the actuator, the leak is likely due to a faulty O-ring on the actuator. In this case, the O-ring should be replaced, the engine compartment cleaned, and any oil-soaked noise insulation replaced. Technicians are instructed to document this finding with date-stamped, VIN-referenced, in-focus, and well-lit photos.
4. Injector Area Inspection: If no substantial oil is found under the valvelift system actuator, the technician proceeds to remove the lower noise insulation. The affected cylinder is then located by checking for oil accumulation around the injector area. Any noise insulation soaked with oil in this area should also be noted.
5. Cylinder Head Cover Removal: The cylinder head cover and its seal are removed.
6. Gasket Groove Inspection: The gasket groove in the cylinder head cover is inspected for casting residues. These residues, which can cause sealing issues, are carefully removed using a suitable tool, such as a small flat screwdriver. Technicians must ensure the seal groove is not damaged during this step.
7. Reassembly and Cleaning: A new seal is installed, and the camshaft cover is re-assembled. The engine compartment is thoroughly cleaned, and any noise insulation that became soaked with oil is replaced.

Required Parts and Tools

Depending on the specific leak source, various parts may be required for the repair. Technicians should consult ETKA for the latest information on fasteners, bolts, nuts, and screws. Key parts that may be needed include:

• 06M906048F: Solenoid valve (if applicable)
• 06M103650D: Gasket for Cylinders 1-3 (if applicable)
• 06M103649D: Gasket for Cylinders 4-6 (if applicable)
• G 12E050S0: Coolant concentrate 1.5L (if applicable)

Warranty Information

This Technical Service Bulletin outlines warranty coverage for eligible repairs. The claim type is 110, covering vehicles up to 48 months or 50,000 miles. Certified Pre-Owned (CPO) vehicles are covered under claim type G10, requiring owner verification. If the vehicle is outside of warranty, the TSB serves as informational guidance only.

Service numbers associated with this issue are 1580 for leaks on the injector and 1551 for leaks on the Audi valvelift system actuator. Corresponding damage codes are 0050 (for 1580 only) and 0010 (for 1551 only). Labor operations are detailed for both 3.0L and 2.9L engines, with specific time units allocated for tasks such as adjusting mechanism removal/reinstallation, camshaft adjuster removal/reinstallation, and engine cleaning.

Revision History

This TSB has undergone several revisions to ensure accuracy and completeness:

• Revision 7 (April 1, 2021): Revised Warranty information, specifically updating labor operations.
• Revision 6 (February 16, 2021): Revised Required Parts and Tools, including an updated part number.
• Revision 5 (January 30, 2021): Revised the header and added a VIN break, along with a revised DOC-IT note in the service section.

NHTSA ID: 10190238