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Audi · Known Issues

2002-2025 Audi S6 Problems: 7 Known Issues

2002-2025 model years · 294+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 294+ owner reports, the 2002-2025 Audi S6 has 7 documented known issues, with 3 rated critical. The most serious are ZF 5HP24 Tiptronic Transmission Valve Body Failure ($1,500-$4,000 repair), 2020-2025 Audi S6 Rearview Camera Software Recall 25V900 / 90TV and 2007-2011 Audi S6 Takata Passenger-Airbag Recall 18V427 / 69R7. The most commonly reported issue is 4.0T Direct Injection Carbon Buildup with 294 owner reports. Across all issues with published estimates, repair costs range from $600 to $4,000. DIY maintenance guides at au7o.io.

In This Article

  • S6 Safety/Recalls2
  • S6 Transmission1
  • S6 Engine2
  • S6 Cooling1
  • S6 Suspension1
  • Recalls11
  • FAQ
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In This Article

  • Safety/Recalls2
  • Transmission1
  • Engine2
  • Cooling1
  • Suspension1
  • Recalls11
  • FAQ

All 7 Known Issues

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ALL YEARS202520242023202220212020201920182017201620152014201320112010200920082007200420032002

Certain 2020-2025 S6 vehicles produced October 22, 2019 through July 10, 2025 are included in recall 25V900/90TV because a software issue can prevent the rearview camera image from displaying. The failure reduces rear visibility and increases crash risk. Eligibility is determined by VIN and the installed parts/software, not model year alone.

Common Symptoms

  • Rearview camera image does not display
  • One or more Top View camera images may fail sporadically
  • Camera image may return after restart or bus sleep

How to Fix

Check the VIN for recall 25V900/90TV and contact an authorized Audi dealer. Dealers will install the more robust driver-assistance software update free of charge. Until repaired, use extra caution when reversing and do not treat a restart or temporary image recovery as completion of the recall.

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NHTSA Verified
High ConfidenceVerifiedReviewed Jul 2026

Certain non-sequential-VIN 2007-2011 S6 sedans produced July 14, 2006 through January 13, 2011 are included in the final Takata passenger-frontal-airbag recall. Degraded inflator propellant can create excessive pressure during deployment, rupture the inflator and send metal fragments into the cabin, causing serious injury or death. There is no advance warning of this condition.

How to Fix

Check the VIN for recall 18V427/69R7 and arrange the free final passenger-frontal-airbag replacement with an Audi dealer. Do not use an airbag warning light to determine recall eligibility; Audi states that the warning light is unrelated to this inflator defect.

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High ConfidenceVerifiedReviewed Jul 2026

The ZF 5HP24 Tiptronic automatic transmission develops valve body issues causing harsh shifts, delayed engagement, and eventually limp mode. The electronic solenoids and valve body bore wear are the primary failure modes.

This issue also affects: Audi A4 Avant, Audi A4, Audi A8

Common Symptoms

  • Harsh shifts
  • Delayed engagement
  • Transmission limp mode
  • Gear hunting on hills

How to Fix

Typical repair cost:$1,500 - $4,000

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Community Reported
Medium Confidence
Community reported
294 owners

The S6 4.0T twin-turbo V8 develops carbon deposits on all eight intake valves. The twin-turbo layout and high heat make carbon accumulation aggressive, with symptoms appearing as early as 30,000 miles.

This issue also affects: Audi RS7, Audi S7, Audi S8

Common Symptoms

  • Rough idle
  • Misfires
  • Power loss
  • Hesitation at low RPM
  • Check engine light
  • Uneven cylinder performance

How to Fix

Walnut blast all eight intake runners. Dual-injection models (2019+) are less affected.

Typical repair cost:$600 - $1,400

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Based on 294 owner reports

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Community Reported
High Confidence294 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026

The Audi S6 C7 with the 4.0T twin-turbo V8 (direct injection) develops carbon buildup on the intake valves since fuel does not wash over them. This reduces airflow and causes misfires, rough idle, and power loss over time.

This issue also affects: Audi RS7, Audi S7, Audi S8

Common Symptoms

  • Rough idle
  • Misfires at idle
  • Power loss
  • Poor fuel economy
  • Hesitation on acceleration

How to Fix

Confirm carbon buildup by scanning for misfire faults (commonly random/multiple or cylinder-specific misfires), reviewing fuel trims, and inspecting the intake valves with a borescope after removing the intake manifold or accessing the ports. The proper repair is an intake valve carbon cleaning, typically walnut shell blasting each intake port with the valves closed, then replacing intake manifold gaskets, injector seals/O-rings or any disturbed PCV-related seals as needed and clearing/adapting the ECU afterward. If buildup is severe or returns quickly, inspect the PCV/oil separator system and crankcase ventilation hoses for excessive oil carryover. Independent shops typically charge about $800-$1,500 for a full walnut blast service on the 4.0T, while dealer pricing can run roughly $1,500-$2,500 depending on labor and gasket/seal replacement.

Typical repair cost:$600 - $1,200

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Community Reported
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Audi TSB 2036167/2 documents slow coolant loss at the turbocharger coolant feed and return connections on 2013 S6 4.0T vehicles in VIN range 000001-127113. Supported signs are a low-coolant warning, a low reservoir level and black encrusted coolant residue at the connections. It does not establish cracking, rapid coolant loss or a six-generation S6 defect.

This issue also affects: Audi RS7, Audi S8, Audi A8

Common Symptoms

  • Low-coolant warning
  • Coolant level below specification
  • Black encrusted residue at turbocharger coolant connections

How to Fix

Confirm the leak source and VIN applicability before ordering parts. For the TSB condition, Audi specifies replacing the coolant feed and return pipes on both cylinder banks, replacing the disturbed oil-feed-pipe O-rings, then refilling and bleeding the cooling system. Service Action 21F7 was VIN-specific and expired in 2019, so current coverage must not be assumed. Do not order the former single pipe or alleged silicone-line kit from this card.

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Manually Verified
High ConfidenceVerifiedReviewed Jul 2026

Audi TSB 2018765/8 covers 2013 C7 S6 vehicles with air suspension when ride-height adjustment is unavailable, the compressor continues running after shutdown and locking, or the system lowers the car and displays a warning. The bulletin identifies a compressor or J403 relay diagnostic path; it does not establish a universal leaking-strut or valve-block defect.

This issue also affects: Audi RS7, Audi S8, Audi A8

Common Symptoms

  • Self-leveling adjustment is unavailable in the MMI
  • Air-suspension compressor continues after shutdown and locking
  • Vehicle is lowered to its lowest position
  • Air-suspension warning light

How to Fix

Have an Audi-qualified technician test the air-suspension compressor and inspect relay J403. Audi directs replacement of both the compressor and relay when the relay has severe contact erosion or an overheated strand; when the compressor sounds normal and the relay has only minor contact marks, replace the relay only. A sagging corner or leak-down condition requires separate leak localization before any strut is replaced. Do not order the former strut or compressor recommendations from this card.

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NHTSA Recalls11 recalls

EQUIPMENT:ELECTRICAL:INFOTAINMENT:VIDEO (TOUCH)SCREEN/MONITOR/UNIT

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021-2022 AUDI A8, A6 Allroad, E-TRON Quattro, 2022 S3, RSQ8, RS7, RS6 Avant, Q8, Q7, Q3, E-TRON Sportback Quattro, S5 Cabriolet, E-TRON GT, S5 Sportback, A7, A6, A5 Sportback, A5 Cabriolet, A4, A4 Allroad, A3, S8, SQ7, SQ8, S6, and S4 vehicles. The infotainment main unit may become damaged internally when the vehicle is shut off, resulting in an inoperative rearview camera display the next time the vehicle is started. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."

Campaign #22V80600026/10/2022

ELECTRICAL SYSTEM

Volkswagen Group of America, Inc. (Audi) is recalling certain 2020-2022 Audi S7, S6 Sedan, A6 Allroad, 2021-2022 RS7, RS6 Avant, 2019-2022 A7, and A6 Sedan vehicles. Liquid spilled in the rear seat may penetrate and cause the gateway control module to shut down.

Campaign #22V86100021/11/2022

ELECTRICAL SYSTEM:INSTRUMENT PANEL:FUEL GAUGE:FUEL LEVEL FLOAT/SENSOR/SENDING UNIT

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021-2022 RS6 Avant and RS7, 2020-2022 A6 Allroad, S6 Sedan, and S7, and 2019-2022 A6 Sedan and A7 vehicles. The fuel level sender may stick, causing an inaccurate fuel level reading to be displayed on the instrument cluster.

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Other Audi Models

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Frequently Asked Questions

What are the most common Audi S6 problems?

According to Au7o's analysis of 294+ owner reports, the 2002-2025 Audi S6 has 7 documented issues. The most frequently reported are: ZF 5HP24 Tiptronic Transmission Valve Body Failure, 2020-2025 Audi S6 Rearview Camera Software Recall 25V900 / 90TV, 2007-2011 Audi S6 Takata Passenger-Airbag Recall 18V427 / 69R7. Of these, 3 are rated critical and should be addressed promptly.

Is the Audi S6 reliable?

The 2002-2025 Audi S6 has 7 known issues documented across 294+ owner reports. 3 issues are rated critical: ZF 5HP24 Tiptronic Transmission Valve Body Failure and 2020-2025 Audi S6 Rearview Camera Software Recall 25V900 / 90TV and 2007-2011 Audi S6 Takata Passenger-Airbag Recall 18V427 / 69R7. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Audi S6 problems?

Repair costs for known Audi S6 issues range from $600 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, ZF 5HP24 Tiptronic Transmission Valve Body Failure, typically costs $1,500-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Audi S6 is the most reliable?

Reliability varies across model years of the Audi S6. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2002-2025 Audi S6 with 7 documented issues documented across 294+ owner reports.

What is the 2002-2004 Audi S6 ZF 5HP24 Tiptronic Transmission Valve Body Failure?

The ZF 5HP24 Tiptronic automatic transmission develops valve body issues causing harsh shifts, delayed engagement, and eventually limp mode. The electronic solenoids and valve body bore wear are the primary failure modes. Repairs typically run $1,500-$4,000. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 294+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #22V15500014/03/2022

BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2026 vehicles. Please see the recall report for a complete list of models. A software error may prevent the rearview camera image from displaying as intended. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."

Campaign #25V90000019/12/2025

SEAT BELTS:REAR/OTHER:RETRACTOR

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."

Campaign #21V60600005/08/2021

+ 6 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

What is the 2020-2025 Audi S6 2020-2025 Audi S6 Rearview Camera Software Recall 25V900 / 90TV?

Certain 2020-2025 S6 vehicles produced October 22, 2019 through July 10, 2025 are included in recall 25V900/90TV because a software issue can prevent the rearview camera image from displaying. The failure reduces rear visibility and increases crash risk. Eligibility is determined… Severity: high.

What is the 2007-2011 Audi S6 2007-2011 Audi S6 Takata Passenger-Airbag Recall 18V427 / 69R7?

Certain non-sequential-VIN 2007-2011 S6 sedans produced July 14, 2006 through January 13, 2011 are included in the final Takata passenger-frontal-airbag recall. Degraded inflator propellant can create excessive pressure during deployment, rupture the inflator and send metal fragm… Severity: high.

What is the 2013-2024 Audi S6 4.0T Direct Injection Carbon Buildup?

The S6 4.0T twin-turbo V8 develops carbon deposits on all eight intake valves. The twin-turbo layout and high heat make carbon accumulation aggressive, with symptoms appearing as early as 30,000 miles. Repairs typically run $600-$1,400. Severity: medium.

What is the 2013 Audi S6 2013 Audi S6 Turbocharger Coolant-Pipe Seepage - Diagnosis Required?

Audi TSB 2036167/2 documents slow coolant loss at the turbocharger coolant feed and return connections on 2013 S6 4.0T vehicles in VIN range 000001-127113. Supported signs are a low-coolant warning, a low reservoir level and black encrusted coolant residue at the connections. It… Severity: medium.

What is the 2013 Audi S6 2013 Audi S6 Air-Suspension Compressor or Relay Fault - Diagnosis Required?

Audi TSB 2018765/8 covers 2013 C7 S6 vehicles with air suspension when ride-height adjustment is unavailable, the compressor continues running after shutdown and locking, or the system lowers the car and displays a warning. The bulletin identifies a compressor or J403 relay diagn… Severity: medium.

What is the 2013-2018 Audi S6 4.0T Carbon Buildup on Intake Valves?

The Audi S6 C7 with the 4.0T twin-turbo V8 (direct injection) develops carbon buildup on the intake valves since fuel does not wash over them. This reduces airflow and causes misfires, rough idle, and power loss over time. Repairs typically run $600-$1,200. Severity: medium.