2023-2026 Audi MIL On and Engine DTCs TSB 2014753

Audi has released Technical Service Bulletin (TSB) 01 24 48 2014753/13 to address common engine performance issues. These include the Malfunction Indicator Lamp (MIL) illuminating and the Engine Control Module (ECM), J623, storing various Diagnostic Trouble Codes (DTCs) related to misfires, air/fuel ratio imbalance, or a lean fuel system. This bulletin supersedes an earlier version, 23-41, and provides updated information on diagnosis and repair.

The primary cause identified for these conditions is the use of contaminated gasoline or fuel lacking sufficient deposit control additives. This can lead to excessive carbon buildup and affect engine operation.

Symptoms

Owners may notice several symptoms if their vehicle is affected by poor fuel quality or deposit buildup. These conditions can range from subtle performance changes to more significant operational issues, potentially triggering the Audi e-tron MIL P030000.

Common symptoms include:

• Excessive accumulation of deposits on intake valves, intake manifold, fuel injectors, and combustion chambers.
• Engine running rough after a cold start.
• Excessive engine cranking time.
• Hesitations while driving.
• Rough engine idle.
• Reduced engine performance.
• Poor fuel economy.

Fault Codes / DTCs

When these conditions become severe, the Malfunction Indicator Lamp (MIL) may illuminate, and the Engine Control Module (ECM), J623, will store specific Diagnostic Trouble Codes (DTCs). These codes indicate the nature of the engine's concern.

Code Category	Example DTCs
Misfires	P0300, P030x
Lean Fuel System	P0171, P0174, P1128, P1130, P1136, P1138
Air/Fuel Ratio Imbalance	P219C00, P219D00, P219E00, P219F00, P21A000, P21A100

Diagnosis / Trigger Conditions

The root cause for these issues is often related to the quality of gasoline used. Contaminated gasoline or fuel with a low content of deposit control additives can lead to carbon buildup. For MY16-MY19 3.0TFSI EVO (CREC) equipped vehicles, specific fuel quality deviations can cause deposits in injectors, leading to a rich mixture after shutdown and difficult starts. It is important to note that for this specific issue, injectors should not be replaced initially.

Contaminated gasoline may have a unique color or odor, contain undissolved water, sediments, or appear cloudy. Gasoline with low deposit control additives simply lacks the necessary components to prevent carbon buildup effectively.

Repair Procedure Summary

The repair procedure focuses on addressing the fuel quality and deposit buildup. For MY16-MY19 3.0TFSI EVO (CREC) vehicles, a multi-purpose gasoline additive should be used first to remove deposits from injectors. If the issue persists after using the additive, further diagnosis is required.

For general carbon deposit removal, gasoline additive G 001770A2 can be used. This additive helps clean deposits from injectors (MPI and FSI engines), combustion chambers (MPI and FSI engines), and intake valves (MPI engines only). The additive should be mixed directly into a full fuel tank at a ratio of 60 ml per 20 liters of gasoline (or 120 ml per 10 gallons).

Specifically for MY16-MY19 3.0TFSI EVO (CREC) equipped vehicles, additive G 001780M3 (200 ml) should be used. For intake valve carbon deposits in FSI engines, TSB 2019948 (01 MIL on, P0300 and/or P0301 - P0306 stored in ECM) provides additional guidance.

Required Tools or Parts

To address the conditions described in this TSB, specific gasoline additives are recommended:

• G 001770A2: Gasoline additive for general carbon deposit removal.
• G 001780M3: Specific additive for MY16-MY19 3.0TFSI EVO (CREC) vehicles.

Any additional fasteners, bolts, nuts, and screws required for repair procedures should be referenced in ETKA/ELSA.

Owner Action

If you are experiencing the MIL on, misfires, or other symptoms described, particularly the Audi e-tron MIL P030000, it is recommended to take action to improve fuel quality. Consider changing your gasoline source if you suspect contamination. Audi strongly recommends using TOP TIER Detergent Gasoline, which is designed to provide improved deposit control performance. Retailers in the USA providing TOP TIER gasoline include 76 Stations, Aloha Petroleum, Chevron, Conoco, Holiday Stationstores, Inc., Kwik Trip / Kwik Star, MFA Oil Co., Mileage Stations, Mobil, Texaco, Ohana Fuels, Tri-Par Oil Co., Phillips 66, U.S. Oil, Road Ranger, Severson Oil, and Shell. An up-to-date list can be found at www.toptiergas.com.

It is important to note that this TSB is informational. The use of gasoline additive G 001770A2 is generally not reimbursed under warranty. If symptoms persist after using high-quality fuel and recommended additives, consult an authorized Audi service center for further diagnosis.

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NHTSA ID: 11012476