What is the 2013-2024 Audi S8 4.0T Turbo Coolant System Degradation?

The S8 4.0T V8 shares coolant line issues with other 4.0T Audi models but the heavier sedan and higher power tune accelerate wear. Turbo oil and coolant line failures can cause expensive damage if not caught early. Repairs typically run $1,000-$3,500. Severity: high.

What is the 2013-2018 Audi S8 Water-to-Air Intercooler Internal Coolant Leak (Coolant into Intake)?

The 4.0T uses a compact water-to-air charge-air cooler mounted in the hot 'V' between the cylinder banks. The intercooler core can develop an internal leak that allows engine coolant to weep directly into the pressurized intake path. Owners report slow, unexplained coolant loss w… Repairs typically run $1,500-$3,500. Severity: high.

What is the 2013-2016 Audi S8 2013-2016 S8 Porous Fuel-Pump Supply Line / Fire Risk - Recall 19V057?

NHTSA recall 19V057 / Audi 20BM covers certain 2013-2016 S8 vehicles. The low-pressure supply line feeding the high-pressure fuel pump can become porous, causing fuel odor or leakage; fuel near an ignition source increases fire risk. The affected line is not itself a high-pressur… Severity: high.

What is the 2013-2017 Audi S8 2013-2017 S8 Blocked Turbocharger Oil Strainer / Stall Risk - Recall 22V178?

NHTSA recall 22V178 / Audi 21H7 covers certain 2013-2017 S8 vehicles. Carbon or deposits can block the turbocharger oil-supply strainer, reducing bearing lubrication. Bearing wear can allow the turbine wheel to contact the housing or the shaft to break, causing loss of power or e… Severity: high.

What is the 2013-2015 Audi S8 2013-2015 S8 COD Vibration with J931 Basic-Setting Fault - Diagnosis Required?

Audi TSB 2036392/6 covers 2013-2015 S8 4.0 TFSI vehicles with vibration around 1000 and 3000 rpm and possible B201000 or B200500 in the sub-frame mount controller J931. Work on electrical-system controllers J519/J520 can deactivate J931 active-mount basic settings. The bulletin d… Severity: medium.

What is the 2013-2018 Audi S8 Direct-Injection Carbon Buildup on Intake Valves (Misfires / Rough Idle)?

Like other VAG direct-injection engines, the 4.0T runs port-bypassing direct injection, so no fuel washes the back of the intake valves. Carbon deposits accumulate on the valves and ports over time, restricting airflow and degrading the seal. Owners report a gradual power loss, r… Repairs typically run $600-$1,400. Severity: medium.

What is the 2007-2018 Audi S8 Clogged Sunroof / Plenum Drains Causing Water Intrusion and Electronics Damage?

Like other large Audi sedans, the S8 relies on sunroof drain channels and cowl/plenum drains to route rainwater away from the cabin and the electronics housed in the plenum area. The plastic drain connectors and channels become brittle and crack, and the plenum drains clog with d… Repairs typically run $200-$3,500. Severity: medium.

What is the 2013-2018 Audi S8 2013-2018 S8 Warm-Soak Long-Crank or No-Start - Fuel Diagnosis Required?

Audi TSB 2046724/5 covers sporadic warm-engine no-start or long cranking after the vehicle sits without fully cooling. A rich-mixture DTC may occur, but often there is no DTC. Audi’s procedure distinguishes fuel in the oil from a short-trip profile, ECM software, high-pressure in… Severity: medium.

What is the 2013-2016 Audi S8 2013-2016 S8 Warm-Idle Whistle from Crankcase Breather Leak - Diagnosis Required?

Audi TSB 2040644/6 covers a metallic whistling or grinding sound at warm idle, a sporadic MIL and possible P2279 or P0507 on 4.0 TFSI vehicles. A leak in the crankcase breather pressure-regulating module can cause the condition. Audi’s labor table explicitly includes the S8. Severity: medium.

Audi · Known Issues

2014 Audi S8 Problems: 11 Known Issues

2014 model year · 823+ owner reports · Updated September 2026

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According to Au7o's analysis of 823+ owner reports, the 2014 Audi S8 has 11 documented known issues, with 6 rated critical. The most serious are Adaptive Air Suspension Multi-Point Failure ($1,200-$4,500 repair), ZF 8-Speed Torque Converter and Valve Body Issues ($2,500-$6,000 repair), 4.0T Turbo Coolant System Degradation ($1,000-$3,500 repair), Water-to-Air Intercooler Internal Coolant Leak (Coolant into Intake) ($1,500-$3,500 repair), 2013-2016 S8 Porous Fuel-Pump Supply Line / Fire Risk - Recall 19V057 and 2013-2017 S8 Blocked Turbocharger Oil Strainer / Stall Risk - Recall 22V178. The most commonly reported issue is Adaptive Air Suspension Multi-Point Failure with 292 owner reports. Across all issues with published estimates, repair costs range from $200 to $6,000. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Audi S8 problems?

According to Au7o's analysis of 823+ owner reports, the 2014 Audi S8 has 11 documented issues. The most frequently reported are: Adaptive Air Suspension Multi-Point Failure, ZF 8-Speed Torque Converter and Valve Body Issues, 4.0T Turbo Coolant System Degradation. Of these, 6 are rated critical and should be addressed promptly.

Is the Audi S8 reliable?

The 2014 Audi S8 has 11 known issues documented across 823+ owner reports. 6 issues are rated critical: Adaptive Air Suspension Multi-Point Failure and ZF 8-Speed Torque Converter and Valve Body Issues and 4.0T Turbo Coolant System Degradation and Water-to-Air Intercooler Internal Coolant Leak (Coolant into Intake) and 2013-2016 S8 Porous Fuel-Pump Supply Line / Fire Risk - Recall 19V057 and 2013-2017 S8 Blocked Turbocharger Oil Strainer / Stall Risk - Recall 22V178. 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 S8 problems?

Repair costs for known Audi S8 issues range from $200 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Adaptive Air Suspension Multi-Point Failure, typically costs $1,200-$4,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2013-2024 Audi S8 Adaptive Air Suspension Multi-Point Failure?

The S8 full-size luxury sedan places extreme demands on the air suspension system. All four struts and the compressor commonly need replacement between 60,000-100,000 miles. The heavy curb weight accelerates bladder wear. Repairs typically run $1,200-$4,500. Severity: high.

What is the 2013-2024 Audi S8 ZF 8-Speed Torque Converter and Valve Body Issues?

The S8 high-torque application stresses the ZF 8HP torque converter and valve body. Shudder, delayed shifts, and harsh engagement develop as the converter clutch wears and valve body solenoids degrade. Repairs typically run $2,500-$6,000. Severity: high.

All 11 Known Issues

Other Audi Models

Frequently Asked Questions

What are the most common Audi S8 problems?

Is the Audi S8 reliable?

How much does it cost to fix common Audi S8 problems?

What is the 2013-2024 Audi S8 Adaptive Air Suspension Multi-Point Failure?

What is the 2013-2024 Audi S8 ZF 8-Speed Torque Converter and Valve Body Issues?

When Issues Typically Appear

2013-2024 Audi S8: 4.0T Turbo Coolant System Degradation#

2013-2018 Audi S8: Water-to-Air Intercooler Internal Coolant Leak (Coolant into Intake)#

2013-2016 Audi S8: 2013-2016 S8 Porous Fuel-Pump Supply Line / Fire Risk - Recall 19V057#

2013-2017 Audi S8: 2013-2017 S8 Blocked Turbocharger Oil Strainer / Stall Risk - Recall 22V178#

2013-2024 Audi S8: Adaptive Air Suspension Multi-Point Failure#

2013-2024 Audi S8: ZF 8-Speed Torque Converter and Valve Body Issues#

2013-2015 Audi S8: 2013-2015 S8 COD Vibration with J931 Basic-Setting Fault - Diagnosis Required#

2013-2018 Audi S8: Direct-Injection Carbon Buildup on Intake Valves (Misfires / Rough Idle)#

2013-2016 Audi S8: 2013-2016 S8 Warm-Idle Whistle from Crankcase Breather Leak - Diagnosis Required#

2007-2018 Audi S8: Clogged Sunroof / Plenum Drains Causing Water Intrusion and Electronics Damage#

2013-2018 Audi S8: 2013-2018 S8 Warm-Soak Long-Crank or No-Start - Fuel Diagnosis Required#