What are the most common Mercedes-Benz S-Class problems?

According to Au7o's analysis of 4,100+ owner reports, the 2004 Mercedes-Benz S-Class has 2 documented issues. The most frequently reported are: ABC Hydraulic Suspension System Leak, Power Steering Pump Leak. Of these, 1 is rated critical and should be addressed promptly.

Is the Mercedes-Benz S-Class reliable?

The 2004 Mercedes-Benz S-Class has 2 known issues documented across 4,100+ owner reports. 1 issue is rated critical: ABC Hydraulic Suspension System Leak. 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 Mercedes-Benz S-Class problems?

Repair costs for known Mercedes-Benz S-Class issues range from $300 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, ABC Hydraulic Suspension System Leak, typically costs $1,000-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2000-2013 Mercedes-Benz S-Class ABC Hydraulic Suspension System Leak?

The Active Body Control (ABC) hydraulic suspension system develops leaks in the struts, lines, tandem pump, and accumulators. Repairs are extremely expensive as the system operates at 3,000+ PSI. Leaks cause the car to sag and ride harshly. Repairs typically run $1,000-$6,000. Severity: high.

What is the 2000-2010 Mercedes-Benz S-Class Power Steering Pump Leak?

The power steering pump develops a leak at the shaft seal or high-pressure line fitting, causing fluid loss and a whining noise when turning. Low fluid levels can damage the steering rack and ABC system (if equipped). Repairs typically run $300-$1,200. Severity: medium.

Mercedes-Benz · Known Issues

2004 Mercedes-Benz S-Class Problems: 2 Issues Every Owner Should Know

2004 model year · 4,100+ owner reports · Updated June 2026

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According to Au7o's analysis of 4,100+ owner reports, the 2004 Mercedes-Benz S-Class has 2 documented known issues, with 1 rated critical. The most serious is ABC Hydraulic Suspension System Leak ($1,000-$6,000 repair). The most commonly reported issue is ABC Hydraulic Suspension System Leak with 3,000 owner reports. Across all issues with published estimates, repair costs range from $300 to $6,000. DIY maintenance guides at au7o.io.

2004 Mercedes-Benz S-Class Problems: 2 Issues Every Owner Should Know

All 2 Known Issues

2000-2013 Mercedes-Benz S-Class: ABC Hydraulic Suspension System Leak#

Common Symptoms

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2000-2010 Mercedes-Benz S-Class: Power Steering Pump Leak#