2003 Mercedes Benz S430: Reliability Data
When Do Complaints Happen?
Distribution of NHTSA complaints by vehicle mileage at time of report.
What Fails?
Most reported component issues from NHTSA complaints.
Severity Assessment
Sample Complaint Reports
"TL*THE CONTACT OWNS A 2003 MERCEDES BENZ S430. THE CONTACT STATED THAT THE VEHICLE DOES NOT ACCELERATE WHEN THE ACCELERATOR PEDAL IS DEPRESSED. THE VEHICLE REACTED AS IF THE BRAKE PEDAL WAS DEPRESSED. HE TOOK THE VEHICLE TO THE DEALER AND THEY STATED THAT THE VEHICLE WAS PROGRAMMED IN THAT MANNER..."
"TL*THE CONTACT OWNS A 2003 MERCEDES BENZ S430. THE SEAT BELTS ARE LOCKED AND WOULD NOT RELEASE WHEN THE DRIVER AND PASSENGER ATTEMPTED TO ADJUST THEM. THE DEALER STATED THAT THIS FAILURE OCCURRED FREQUENTLY AND WILL REPLACE THE SEAT BELTS FOR $1200. THE FAILURE MILEAGE WAS 94,402."
"TL*THE CONTACT OWNS A 2003 MERCEDES BENZ S430. THE SEAT BELTS ARE LOCKED AND WILL NOT RELEASE WHEN THE DRIVER AND PASSENGER ATTEMPTED TO ADJUST THEM. THE FAILURE MILEAGE WAS AT 95000."
Source: NHTSA ODI Complaints Database. Names and identifying details omitted.
When Were Complaints Filed?
Number of complaints by the year the issue occurred.
When Does Each Component Fail?
Median mileage at complaint for top components.
Where Are Complaints Coming From?
Top states by complaint count.
Mercedes Benz S430 — Other Years
See how this model compares across different model years.
Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.
Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.
Data through: 2026-03-28
Copy this code to embed on your website: