2003 Mercedes-Benz C320 Engine Problems
- Complaints
- 1about this part
- Share
- 5%of 22 total for the year
- Median mileage
- 36,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the engine of the 2003 Mercedes-Benz C320, 5% of the 22 complaints for this model year. Where a mileage was given, the median is 36,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Check coolant level level warning sign was on. Apparently, there is leaking of coolant some where. It was at the water pump, which was replaced on june 20, 2019. It happens again now, about 9 months later.”
NHTSA complaint #11317690, filed 2020-03, 36,000 milesRelated service bulletins
- 11017039Apr 1, 2025Complaint Vehicle with atypical reduced heat output. Cause Silicate granulate may have escaped from a damaged bag in the expansion reservoir (not visible), reducing the coolant…
Engine: other model years
Other parts of the 2003 Mercedes-Benz C320
7 complaintsTransmission and drivetrain
5 complaintsAir bags
4 complaintsEngine cooling
3 complaintsFuel system
3 complaintsVisibility (wipers, defrost, mirrors)
3 complaintsExterior lighting
2 complaintsSuspension
2 complaintsVehicle speed control
2 complaintsBrakes
1 complaintsEquipment
1 complaintsLatches, locks and linkages
1 complaints
← All problems reported for the 2003 Mercedes-Benz C320
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology