Known issues
Mercedes-Benz engine problems by mileage
Known problems of the Mercedes-Benz engines covered so far, with the models they are fitted to. Each engine page has the symptoms, fault codes, tests and fixes. More engines are added over time.
Renault/Nissan 1.5 dCi (K9K)
Diesel · 2001–2021Mercedes-Benz models: A 180 CDI and B 180 CDI (W176, W246), CLA 180 CDI, Citan
| Problem | Typical mileage |
|---|---|
| Big-end bearing spin high severity | 100,000–220,000 km 60,000–135,000 miles |
| Injector failure and starting problems medium severity | 100,000–250,000 km 60,000–155,000 miles |
| Turbo failure from oil starvation high severity | 120,000–220,000 km 75,000–135,000 miles |
| Particulate filter and oil level rising medium severity | 60,000–200,000 km 35,000–125,000 miles |
Mercedes-Benz OM651 2.1 and 1.8 CDI
Diesel · 2008–2019Mercedes-Benz models: C-Class (W204, W205) and E-Class (W212) 200 to 250 CDI/BlueTEC; GLK (X204); ML 250 BlueTEC (W166); A-, B-, CLA- and GLA-Class 180 to 220 CDI; SLK 250 CDI; Sprinter (906, 2009–2018); Vito and Viano (W639 from 2010, W447)
| Problem | Typical mileage |
|---|---|
| Injector failure on early engines (Delphi piezo) high severity | 40,000–150,000 km 25,000–95,000 miles |
| Injector seal leaks and seized injectors medium severity | 100,000–250,000 km 60,000–155,000 miles |
| Split charge-air hoses and limp mode medium severity | 100,000–250,000 km 60,000–155,000 miles |
Renault/Nissan 1.2 TCe and DIG-T (H5Ft, HRA2DDT)
Petrol · 2012–2018Mercedes-Benz models: Citan 1.2 petrol
| Problem | Typical mileage |
|---|---|
| High oil consumption high severity | 40,000–120,000 km 25,000–75,000 miles |
| Timing chain stretch after running low on oil high severity | 60,000–140,000 km 35,000–85,000 miles |
Real Mercedes-Benz repair cases
Browse Mercedes-Benz casesReviewed cases from colleagues: complaint, measurements, tests and the repair that fixed it.