What are the most common Audi S5 problems?
According to Au7o's analysis of 497+ owner reports, the 2009 Audi S5 has 7 documented issues. The most frequently reported are: High-Pressure Fuel Pump N276 Metering Valve Failure and Cam Follower Wear (4.2 FSI V8), 4.2L FSI V8 (CAUA) Excessive Oil Consumption from Carbon-Clogged Low-Tension Piston Rings, Thermostat and Water Pump Assembly Failure. Of these, 2 are rated critical and should be addressed promptly.
Is the Audi S5 reliable?
The 2009 Audi S5 has 7 known issues documented across 497+ owner reports. 2 issues are rated critical: High-Pressure Fuel Pump N276 Metering Valve Failure and Cam Follower Wear (4.2 FSI V8) and 4.2L FSI V8 (CAUA) Excessive Oil Consumption from Carbon-Clogged Low-Tension Piston Rings. 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 S5 problems?
Repair costs for known Audi S5 issues range from $150 to $14,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, High-Pressure Fuel Pump N276 Metering Valve Failure and Cam Follower Wear (4.2 FSI V8), typically costs $900-$2,600 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2008-2012 Audi S5 High-Pressure Fuel Pump N276 Metering Valve Failure and Cam Follower Wear (4.2 FSI V8)?
The 4.2 FSI V8 runs two camshaft-driven high-pressure fuel pumps. The N276 fuel metering/pressure regulator solenoid integrated into the pump is a documented failure point, and the solenoid is not sold separately, so a failure condemns the whole pump. Separately, the steel cam fo… Repairs typically run $900-$2,600. Severity: high.
What is the 2008-2012 Audi S5 4.2L FSI V8 (CAUA) Excessive Oil Consumption from Carbon-Clogged Low-Tension Piston Rings?
The B8 S5's 4.2L FSI V8 uses low-tension oil control rings that coke up with carbon over time, letting oil past the rings and into the combustion chamber. Owners report burning roughly a quart every 1,000-3,000 miles, and in advanced cases the trapped carbon and oil dilution lead… Repairs typically run $6,000-$14,000. Severity: high.
What is the 2008-2025 Audi S5 Thermostat and Water Pump Assembly Failure?
The S5 3.0T thermostat and water pump assembly uses a plastic housing that degrades over time. Leaks develop at the housing seams and O-ring seals, often around 60,000-80,000 miles. Repairs typically run $400-$1,000. Severity: medium.
What is the 2008-2025 Audi S5 3.0T Supercharger Intercooler Pump Failure?
The water-to-air intercooler system on the S5 3.0T uses an electric coolant pump that can fail, causing elevated charge air temperatures and reduced power. Heat soak becomes severe in warm climates. Repairs typically run $300-$700. Severity: medium.
What is the 2008-2025 Audi S5 Direct Injection Carbon Buildup?
The S5 suffers from carbon deposit accumulation on intake valves common to all Audi direct-injected engines. The performance-oriented tuning makes power loss from carbon more noticeable than in base models. Repairs typically run $400-$900. Severity: medium.
What is the 2008-2017 Audi S5 B8 Front Upper Control Arm Bushing and Ball Joint Wear - Clunk and Steering Wander?
The B8/B8.5 chassis uses a multi-link front end with four upper links per side riding on small rubber bushings. The bushings crack and the ball joints develop play, producing a clunk or rattle over bumps (worst while turning) and a vague, wandering feel at highway speed, along wi… Repairs typically run $800-$2,200. Severity: medium.
What is the 2008-2017 Audi S5 Sunroof Drain Tube Coupling Failure Flooding the Footwells and A-Pillar Trim?
B8 A5/S5 coupes route sunroof water down four drain tubes. The rubber elbow coupling where the tube meets the sunroof cassette hardens and stops sealing, and the tubes themselves clog with debris. Water then runs down the A-pillar and into the front footwell, or into the rear foo… Repairs typically run $150-$900. Severity: medium.
