2018 Mercedes-Benz C 300 engine problems
34 owner complaints filed with NHTSA name the engine on the 2018 Mercedes-Benz C 300 — 35% of all complaints for this model year.
What owners report
“Check engine light comes on, Error Code P052E, after a lot of research, this is a known defective part by Benz. Huge safety issue not addressed by them. Very costly to fix for a customer. There is a new and improved replacement part from Benz indicating they are aware of the faulty old parts that…”
filed Jan 9, 2026
“My vehicle only had 31,000 miles and I experienced engine failure. I bought a new engine for 16, 500. 00 dollars. Mercedes Benz did nothing. I almost got in to several accidents because the engine completely stop on the interstate. Almost got hit by several cars. This is unacceptable.”
filed Oct 23, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine problems in other C 300 years
| Year | Reports | Share |
|---|---|---|
| 2023 C 300 | 2 | 9% |
| 2022 C 300 | 2 | 8% |
| 2020 C 300 | 8 | 24% |
| 2019 C 300 | 15 | 23% |
| 2017 C 300 | 77 | 36% |
Other reported problem areas on the 2018 Mercedes-Benz C 300
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.