Is the 1999 Mercedes-Benz S-Class reliable?

The 1999 Mercedes-Benz S-Class scores 62/100 (D+) on OwnerKeep's reliability index, which places it in the high risk category. See the full report for the specific strengths and failure points.

What are the common problems with the 1999 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 1999 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 1999 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

1999 Mercedes-Benz S-Class Reliability ReportKeepScore 62/100 · top failure points · buy or avoid

62/ 100

KeepScore

HIGH RISK

Grade: D+

A glorious, over-engineered machine from its era that demands an equally glorious, ongoing financial commitment to keep running.

Full system breakdown + what I would do

Quick Facts · 1999 Mercedes-Benz S-Class

Scores 3 points below the strongest nearby year — the 1997 Mercedes-Benz S-Class earns a 65.
The system most likely to surface first: electrical system (major severity).
No active NHTSA safety recalls on record — a clean recall slate for the 1999 model year.

1999 Mercedes-Benz S-Class: Buy or Avoid?

The 1999 Mercedes-Benz S-Class (W140) represents a magnificent era of over-engineering, but today it stands as a formidable financial challenge for the unprepared. While offering unparalleled luxury and vault-like build quality, its immense complexity and age guarantee significant, frequent, and costly repairs; only seasoned enthusiasts with substantial budgets should consider ownership.

Biggest Strengths

Engine durability (if maintained)
Exceptional ride comfort and quietness
Robust body structure and material quality

1999 Mercedes-Benz S-Class — Known Trouble Spots

The systems that break first on the 1999 Mercedes-Benz S-Class. Mileage windows, repair costs, and fix-before-you-buy notes are in the full report.

Electrical Systemmajor

Climate Control Systemcritical

Vacuum Systemmoderate

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

Safety Recalls on the 1999 Mercedes-Benz S-Class

No active NHTSA safety recalls on file for the 1999 Mercedes-Benz S-Class. Always verify with your VIN atnhtsa.gov.

What breaks on the 1999 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 1999s Worth a Look

Similar class, similar year range — ranked by KeepScore.

1998 ToyotaLand Cruiser

92/100

1997 ChevroletC1500

88/100

1997 ChevroletCorvette

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Frequently Asked Questions

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