2009 Audi S8 Problems: 2 Known Issues
2009 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 Audi S8 has 2 documented known issues, with 1 rated critical. The most serious is 5.2 V10 Timing Chain Tensioner / Guide Wear (D3 Cold-Start Rattle) ($2,500-$6,000 repair). Across all issues with published estimates, repair costs range from $200 to $6,000. DIY maintenance guides at au7o.io.
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All 2 Known Issues
NHTSA Recalls5 recalls
FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2015 Audi S8 and A8 vehicles. The fuel supply line for the high pressure fuel pump may become porous over time, resulting in a fuel leak.
FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2016 Audi A8 and S8 vehicles. The fuel supply line for the high pressure fuel pump may become porous and leak fuel.
STRUCTURE:BODY:HOOD
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2018 Audi S8 and A8 vehicles. The seal around the engine compartment may come loose and contact hot engine components.
VISIBILITY:SUN/MOON ROOF ASSEMBLY
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2013-2014 Audi A8 and S8 vehicles equipped with a standard sunroof, manufactured March 12, 2013, through July 15, 2013. These vehicles are equipped with a standard sunroof glass panel that may shatter.
ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER
Volkswagen Group of America, Inc. (Audi) is recalling certain 2013-2017 A8, S6 Sedan, S7, S8, and 2014-2017 RS7 vehicles. The turbocharger oil supply strainer can become blocked, causing wear to the bearings due to lack of lubrication.
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Frequently Asked Questions
What are the most common Audi S8 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 Audi S8 has 2 documented issues. Documented issues include: 5.2 V10 Timing Chain Tensioner / Guide Wear (D3 Cold-Start Rattle), Clogged Sunroof / Plenum Drains Causing Water Intrusion and Electronics Damage. Of these, 1 is rated critical and should be addressed promptly.
Is the Audi S8 reliable?
The 2009 Audi S8 has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 5.2 V10 Timing Chain Tensioner / Guide Wear (D3 Cold-Start Rattle). 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, 5.2 V10 Timing Chain Tensioner / Guide Wear (D3 Cold-Start Rattle), typically costs $2,500-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2007-2009 Audi S8 5.2 V10 Timing Chain Tensioner / Guide Wear (D3 Cold-Start Rattle)?
The D3-generation S8 uses the 5.2L FSI V10 (shared lineage with the Lamborghini Gallardo/R8 V10). Its timing is driven by chains with plastic guides and hydraulic tensioners located at the rear of the engine. Over time and with deferred oil changes, the tensioners and guides wear… Repairs typically run $2,500-$6,000. Severity: high.
What is the 2007-2009, 2013-2018 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.
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.