Is the 2009 Mercedes-Benz S-Class reliable?

The 2009 Mercedes-Benz S-Class scores 62/100 (D+) on OwnerKeep's reliability index, which places it in the moderate risk category. See the full report for the specific strengths and failure points.

What are the common problems with the 2009 Mercedes-Benz S-Class?

See the Common Issues section above for the top failure areas reported by real owners, with typical mileage ranges where problems start showing up.

How much does it cost to maintain a 2009 Mercedes-Benz S-Class?

Expected maintenance costs depend heavily on age, mileage and how well the vehicle was kept up. Run the full report for a year-by-year cost outlook.

What should I check before buying a 2009 Mercedes-Benz S-Class?

Focus on the top risk areas flagged in this report, review service history, and verify the vehicle is not inside one of the mileage danger zones listed above.

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Reliability AnalysisBased on known issue patterns, repair cost data, and ownership trends · How we score

2009 Mercedes-Benz S-Class Reliability ReportKeepScore 62/100 · top failure points · buy or avoid

62/ 100

KeepScore

MODERATE RISK

Grade: D+

A truly luxurious experience, but budget generously for its inevitable, complex, and expensive maintenance demands.

Full system breakdown + what I would do

Quick Facts · 2009 Mercedes-Benz S-Class

Scores 10 points below the strongest nearby year — the 2011 Mercedes-Benz S-Class earns a 72.
The system most likely to surface first: airmatic air suspension (major severity).
No active NHTSA safety recalls on record — a clean recall slate for the 2009 model year.

2009 Mercedes-Benz S-Class: Buy or Avoid?

Acquiring a 2009 Mercedes-Benz S-Class means buying into a world-class luxury sedan, but it's crucial to understand that this prestige comes with a significant potential for high maintenance and repair costs. While the build quality is superb, the vehicle's inherent complexity and aging technology can lead to substantial financial outlays. This isn't a purchase for the faint of heart or those on a strict budget, but rather an opportunity for those willing to invest in its upkeep to enjoy a truly remarkable driving experience.

Biggest Strengths

Exceptional build quality and premium materials
Robust engine and transmission (if maintained)
Unparalleled comfort and luxury features for its class and age

2009 Mercedes-Benz S-Class — Known Trouble Spots

The systems that break first on the 2009 Mercedes-Benz S-Class. Mileage windows, repair costs, and fix-before-you-buy notes are in the full report.

Airmatic Air Suspensionmajor

COMAND & Electrical Systemsmoderate

Engine Oil Leaks & Auxiliary Failuresmoderate

Typical mileage, cost ranges, and the exact what-to-check list are in the full report.

Safety Recalls on the 2009 Mercedes-Benz S-Class

No active NHTSA safety recalls on file for the 2009 Mercedes-Benz S-Class. Always verify with your VIN atnhtsa.gov.

What breaks on the 2009 Mercedes-Benz S-Class?

Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.

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Mercedes-Benz S-Class — Year-by-Year Comparison

Compare KeepScores across nearby years of the Mercedes-Benz S-Class. Click any year for its full report.

All Mercedes-Benz S-Class years ranked →Mercedes-Benz S-Class years to avoid →Mercedes-Benz S-Class common problems →

Competing 2009s Worth a Look

Similar class, similar year range — ranked by KeepScore.

2007 ToyotaLand Cruiser

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Relevant Products for Your 2009 Mercedes-Benz S-Class

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Frequently Asked Questions

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