2009 Audi S4 Reliability ReportCommon Problems, Repair Costs & Expert Verdict
Quick Facts · 2009 Audi S4
- Has 2 NHTSA recalls on record — the most notable involves the air bags:frontal:passenger side:inflator module.
- Scores 7 points below the strongest nearby year — the 2010 Audi S4 earns a 72.
- The system most likely to surface first: engine timing chain system (critical severity).
Should You Buy the 2009 Audi S4?
The 2009 Audi S4 is a potent performance sedan, delivering an intoxicating V8 soundtrack and quattro grip that few rivals can match. However, it carries a significant inherent risk with its 4.2L FSI engine's timing chain system, making it a high-stakes purchase for anyone not prepared for potentially catastrophic repair costs. This car demands a meticulous buyer with a substantial maintenance budget.
While the B7 S4 is an incredibly rewarding car to drive, its substantial risk of catastrophic engine failure due to the timing chain design means it should only be considered by those who fully understand and can afford the potential multi-thousand-dollar repairs. This is not a 'turn-key' reliable daily driver. It's…
Best Model Years
No specific B7 model year stands out as 'best' regarding the 4.2L FSI engine reliability; all carry the same timing chain risk. The B8 generation (2009.5+) with the supercharged V6 is a more reliable choice.
Years to Avoid
All 2005-2009 B7 S4 models with the 4.2L V8 FSI engine, unless significant preventative timing chain service has been performed and documented.
Biggest Strengths
- Engaging V8 performance and sound
- Sophisticated quattro all-wheel drive
- Premium interior quality and understated luxury
Top Risk Areas
The systems that tend to fail first on the 2009 Audi S4, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
The plastic timing chain guides wear out, leading to excessive chain slack and eventually catastrophic engine damage if ignored. The chain system is located at the rear of the engine, requiring engine removal to service, making it an ext…
The complex multi-link front suspension features numerous control arms and bushings that wear out, leading to clunking noises, imprecise handling, and premature tire wear. DRC (Dynamic Ride Control) shocks are also prone to leaking.
Due to the FSI direct injection system, carbon accumulates on the intake valves, restricting airflow and reducing engine performance, fuel economy, and potentially causing misfires. Requires periodic 'carbon cleaning' via walnut blasting…
2009 Audi S4 Mileage Danger Zones
The mileage windows when the 2009 Audi S4 most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Low Risk Zone
At this mileage, most vehicles should still be under their original factory warranty or just beyond. Expect basic maintenance and possibly early signs of suspension component wear if driven hard.
Maintenance Zone
This mileage often necessitates more significant preventative maintenance. Carbon cleaning for the FSI engine becomes important, and you should be vigilant for early timing chain guide warning signs like cold start rattles.
Elevated Risk Zone
This is a critical point where the risk of timing chain guide failure significantly increases. A full suspension refresh is likely due, and you'll encounter more general wear and tear issues across various systems.
High Risk Zone
Beyond 100,000 miles, the 2009 S4 can become a money pit if major preventative maintenance, particularly the timing chain service, has not been performed. Expect significant wear across all major components.
2009 Audi S4 Ownership Cost Outlook
What it typically costs to keep the 2009 Audi S4 on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$800-1,200 (includes specialized oil, filters, spark plugs, and occasional fluid flushes)
Moderate Repairs
$1,500-3,000 occasionally (e.g., carbon cleaning, suspension refresh, MMI module replacement)
How Long Does the 2009 Audi S4 Last?
For any 2009 Audi S4, assume that the timing chain service will be required if there's no proof it's been done, regardless of mileage, but especially beyond 60,000 miles. Approach lower mileage examples with caution, as they are not immune to this issue; higher mileage cars without service are ticking time bombs.
What 2009 Audi S4 Owners Actually Say
What Owners Love
- Incredible V8 engine sound and linear power delivery
- Superior traction and confidence in all weather conditions with quattro AWD
- High-quality, well-appointed interior with comfortable sport seats
- Understated styling that doesn't scream 'performance car'
Common Frustrations
- Constant anxiety and financial burden of the timing chain issue
- Poor fuel economy, especially with the V8 engine
- Expensive parts and specialized labor costs for repairs
- Heavy front end feel due to the V8's placement
Who Should Buy the 2009 Audi S4?
Best For
- Performance enthusiasts prioritizing engine sound and AWD grip
- Individuals with a substantial dedicated repair fund for a 'fun car'
- Experienced DIY mechanics capable of complex engine work
Not Ideal For
- Budget-conscious buyers seeking affordable long-term ownership
- Anyone who needs absolute bulletproof reliability for a daily driver
How the 2009 Audi S4 Compares to Rivals
The B7 S4 sits in a unique niche, offering a blend of luxurious comfort and a potent naturally aspirated V8 with AWD. While rivals like the E46 M3 had their own costly engine issues, the S4's timing chain problem is arguably more common and severe without preventative action.
More Reliable Than
- BMW E46 M3 (known rod bearing issues)
- Mercedes-Benz C55 AMG (less engaging dynamics)
Comparable To
- Subaru WRX STI (different class, but similar high-performance/high-maintenance demands)
- Infiniti G35/G37 (similar luxury-sport appeal, but less power)
NHTSA Recalls
2 recalls on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2005-2008 Audi A4 Sedan, A4 Avant, S4 Avant and S4 Sedan, 2007-2008 RS4 Sedan, 2004 RS4 Cabriolet, 2007-2009 A4 Cabriolet and S4 Cabriolet, 2005-2011 A6 Sedan, 2006-2011 A6 Avant, and 2007-2011 S6 Sedan vehicles. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2009 Audi A4 Cabriolet, S4 Cabriolet, A6 Avant, A6 Sedan and S6 Sedan vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, the District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Additionally, unless included in "Zone B" above, Volkswagen is recalling certain 2005-2008 Audi A4 Avant, A4 Sedan, A6 Sedan, S4 Avant and S4 Sedan vehicles, 2007-2008 A4 Cabriolet, RS4 Sedan, S4 Cabriolet and S6 Sedan vehicles, and 2006-2008 A6 Avant and 2008 RS4 Cabriolet vehicles originally sold, or ever registered, in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
What breaks on the 2009 Audi S4?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
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Audi S4 by Year
Compare KeepScores across nearby years of the Audi S4. Click any year for its full report.
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