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Mercedes-Benz S430Model year report

2003 Mercedes-Benz S430 Problems

Complaints
26filed with NHTSA
Median mileage
93,835miles, 24 complaints with mileage
Recalls
0campaigns on record
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA crash rating
—overall rating starts with 2011 models
EPA fuel economy
18 mpgcombined, 4.3L 8-cyl RWD · 15 city / 22 hwy

Sources: NHTSA records for the 2003 Mercedes-Benz S430 (complaints, recalls, investigations), EPA fuel economy. Report an error

NHTSA recorded 26 consumer complaints for the 2003 Mercedes-Benz S430. The part named most often is electrical system, with 12 complaints (46% of the total), followed by suspension (4) and exterior lighting (3). 24 of the complaints include a mileage, and 4% of those were filed for vehicles with under 50,000 miles; the median is 93,835 miles. Of all complaints, 1 a fire, according to the filers. NHTSA lists 0 recall campaigns and 41 technical service bulletins for this model year. Electrical system complaints overlap with 5 technical service bulletins filed under the same part.

Not compared (before 2008). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Seats (1), Steering (1), Body and structure (1), Tires (1), Vehicle speed control (1), Wheels (1).

Example complaints

Electrical system: “I have a 2003 mercedes S430. The other day my wife was going down the highway at 65 MPH when it just shut off in the middle of the road. This is very dangerous. How do we allow a vehicle to operate on the highway that would just cut off in the middle of the road without at least giving you a chance to get out of the road. Thanks”

NHTSA complaint #11078449, filed 2018-03, 90,000 miles

Suspension: “Heater and air conditioner fan motor failed on my 2003 S430. Which is dangerous in seasonal climate conditions I've had to replace this part 2x at 700.00 on both occurances at my own expense which I dont understand when there is a recall for this same issue for previous years 2000,2001.. Recall#2004 070010. …”

NHTSA complaint #10893718, filed 2016-08

Exterior lighting: “The contact owns a 2003 S430 mercedes benz. The plastic cover for the head light bulb melted . The dealer contacted the manufacturer requesting assistance with the repair cost of $500.00. The manufacturer has not responded. She also experienced failure with the battery. The dealer replaced the battery, but it continued to discharge. She took the vehicle back to the dealer, but the technician was unable to determine the cause of the failure. Additionally she cannot read any of the gauges or display on the instrument control panel. The failure and current mileages were 1,700. …”

NHTSA complaint #10297283, filed 2009-12, 1,700 miles

Seat belts: “The contact owns a 2003 mercedes benz S430. The contact stated that the front driver's seat belt seized and would not retract or pull out further from its pretensioner. The dealer was notified and stated that there were no recalls or warranties addressing the failure. The contact was advised to bring the vehicle in for an inspection. The manufacturer was not notified. The failure mileage was 50,000 and the current mileage was 60,000.”

NHTSA complaint #10467696, filed 2012-07, 50,000 miles

Mileage when problems were reported

4% of the 24 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 66,000 and 120,000 miles.

4%0–100%10–250%25–5029%50–7525%75–10029%100–15013%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (24 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 93,835 miles.

Complaints by year filed

Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

4201020122014201620182021
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Fuel economy and running cost

EPA ratings for each 2003 Mercedes-Benz S430 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
S430 RWD4.3L 8-cyl5-speed automatic152218$4,550
S430 4matic 4WD/AWD4.3L 8-cyl5-speed automatic152017$4,850

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

NHTSA lists no recall campaigns for the 2003 Mercedes-Benz S430 in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 41 on record; the latest 10 are shown.

See all 41 bulletins →

Other model years of the Mercedes-Benz S430

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
200612101,8000—19—Not enough data
200511100,0000—19—Not enough data
20041878,0000—19—Falling
20032693,8350—18Not compared (before 2008)Falling
200231111,0000—18Not compared (before 2008)Falling
20017390,5000—18Not compared (before 2008)Falling
200023133,0000—18—Falling

All Mercedes-Benz S430 model years · Best and worst years by complaints

Frequently asked questions

How many NHTSA complaints does the 2003 Mercedes-Benz S430 have?

NHTSA recorded 26 consumer complaints for the 2003 Mercedes-Benz S430 as of Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2003 Mercedes-Benz S430 is reported most often?

Electrical system is named most often, in 12 complaints (46% of the total), followed by suspension with 4.

Has the 2003 Mercedes-Benz S430 been recalled?

NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2003 Mercedes-Benz S430 get?

The EPA rates the 2003 Mercedes-Benz S430 (S430, 4.3L 8-cyl) at 18 mpg combined, 15 city and 22 highway, with an estimated annual fuel cost of $4,550 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2003 Mercedes-Benz S430 reported?

Among the 24 complaints that include a mileage, the median is 93,835 miles and the middle half falls between 66,000 and 120,000 miles; 4% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.