Verdict · NHTSA data
Limited data — recalls on file
NHTSA has just 20 complaints on file for the 2004 Mercedes-Benz C-Class — too few to judge reliability from owner reports alone — but one recall campaign applies to this year, so any used example should have its VIN checked for completed recall work.
20
NHTSA complaints
1
Recalls
0
Investigations
2
Crash-involved
3
Fires reported
3
Injuries
0
Deaths
—
NCAP overall
| Component | Complaints | Share | vs prior year |
|---|---|---|---|
| Visibility & Wipers | 3 | 15% | ▲ up |
| Transmission | 3 | 15% | ▲ up |
| Engine | 3 | 15% | ▲ up |
| Seats | 2 | 10% | ▼ down |
| Electrical System | 2 | 10% | ▼ down |
| Airbags | 2 | 10% | ▲ up |
| Tires & Wheels | 2 | 10% | ▼ down |
| Fuel System | 1 | 5% | — flat |
| Other | 1 | 5% | — flat |
| Steering | 1 | 5% | — flat |
1 NHTSA recall campaign on file. Recall repairs are free at franchised dealers.
Defect
ON CERTAIN PASSENGER VEHICLES, SOME SEAT BELT BUCKLES MAY HAVE A BURR ON A METAL COMPONENT OF THE LOCKING MECHANISM. THE PRESENCE OF THE BURR COULD PREVENT THE SEAT BELT FROM LOCKING UNDER CERTAIN CIRCUMSTANCES.
Consequence
IN THE EVENT OF A CRASH, THE SEAT OCCUPANT MAY NOT BE PROPERLY RESTRAINED, INCREASING THE RISK OF INJURY.
Remedy
DEALERS WILL REPLACE THE SEAT BELTS. OWNER NOTIFICATION BEGAN ON DECEMBER 22, 2003. OWNERS SHOULD CONTACT MERCEDES-BENZ AT 1-800-367-6372.
Representative excerpts, cleaned of personal information. These are consumer statements, not verified defects.
“2004 MERCEDES BENZ C- CLASS WAGON. CONSUMER WRITES IN REGARDS TO DEFECT THAT ALLOWS COOLANT TO LEAK INTO THE TRANSMISSION, REQUIRING REPLACEMENT OF THE TRANSMISSION, TORQUE CONVERTER AND RADIATOR *TGW THE CONSUMER STATED HE WAS FORCED TO SPEND OVER SIX THOUSAND DOLLARS TO HAVE THE TRANSMISSION…”
“I WAS TRAVELING ON THE FREEWAY (APPROXIMATE SPEED 60 MPH) WHEN I HEARD SOMETHING HIT THE WINDSHIELD OF MY 2004 MERCEDES C240. THERE WAS NO IMMEDIATE SIGNS OF DAMAGE. HOWEVER, ABOUT 30 MINUTES LATER AFTER I HAD MADE STOP AND LATER RETURNED TO THE CAR I NOTICED A 12 INCH CRACK IN THE WINDSHIELD. I…”
“I HAVE BLACK MERCEDES C230 KOMPRESSOR SPORTS SEDAN 2004 MODEL. CAR WAS PURCHASED BRAND NEW AT MERCEDES AUTHORIZED DEALER. THERE IS NO MODIFICATION MADE TO THIS CAR AND ALL THE SERVICING DONE AT MERCEDES AUTHORIZED DEALER SINCE I BOUGHT THIS CAR. IT HAD ONLY 58000 MILES. LAST B SERVICING WHICH…”
“I HAVE A 2004 MERCEDES C230 COMPRESSOR. YESTERDAY, I DROVE THE VEHICLE HOME AND AFTERWARDS LEFT IT PARKED. ALL OF A SUDDEN, THERE WAS SMOKE COMING FROM THE INTERIOR OF THE CAR. IT ENGULFED THE WHOLE VEHICLE IN SMOKE AND DAMAGED MOST OF THE INTERIOR. THE FIRE INVESTIGATOR CAME ,AND STATED THAT IT…”
“NEW 2004 C230K COUPE. DRIVERS SEAT HAD SLIGHT ROCKING MOTION FORWARD AND BACK FROM THE DAY OF PURCHASE. NOTIFIED DEALER - SAID WAS NORMAL. ROCKING MOTION GOT WORSE AND AGAIN NOTIFIED DEALER AT 5000 MILES ON ODOMETER. DEALER SAID SEAT ADJUSTER WAS COMING LOOSE FROM SEAT FRAME, APPARENTLY THE BOLTS…”
The record is thin — 20 NHTSA complaints — so owner-report data can't strongly confirm reliability either way, though 1 recall should be verified as completed.
According to NHTSA complaint data, the leading problem areas are engine (3 complaints), transmission (3 complaints), visibility & wipers (3 complaints).
Yes — NHTSA lists 1 recall campaign affecting the 2004 Mercedes-Benz C-Class. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.
Based on complaint rates and open investigations, the C-Class years to avoid are 1995, 2002. The cleanest record among C-Class years belongs to 1991.
Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.
Compiled by Sharon Ben-Moshe, Founder.