The OM654 has proven to be a robust and reliable engine since its introduction. With a risk score of 4.0/10, it is considered a safe choice for a used car purchase. The primary concerns revolve around the complex emissions control systems (AdBlue), which is common for modern diesels. Routine maintenance is crucial, but major mechanical failures are rare compared to its predecessor.
Mercedes-Benz OM654
OM654 Engine
The OM654 is a 2.0-liter inline-4 diesel engine from Mercedes-Benz, introduced in 2016 as a successor to the widely used OM651. It is part of a modular engine family and features a compact design with an aluminum block and steel pistons. This engine serves as the backbone for Mercedes' diesel lineup, offering a balance of efficiency and performance.
Typical Use Cases
- Mercedes C-Class (W205/W206): 2018–Present
- Mercedes E-Class (W213): 2016–Present
- Mercedes GLC (X253): 2019–Present
This overview summarizes the reliability of the Mercedes-Benz OM654, including common issues and cost drivers.
Technical Specifications
Manufacturer
Mercedes-Benz
Fuel Type
Diesel
Displacement
2.0 L
Production
2016–Present
Power Output
150 hp
Emissions
Euro 6d
Reliability Analysis
Recommended
Autoscore Verdict
Recommended. The OM654 is a solid modern diesel engine that offers good reliability and efficiency. Just be mindful of the AdBlue system.
Risk Score
4
out of 10
Common Problems & Weak Points
| Issue | Typical Mileage | Repair Cost (Est.) | Severity |
|---|---|---|---|
| AdBlue System Issues | ~100,000 km | €500 – €1200 | Medium |
AdBlue System Issues
The AdBlue system in the OM654 engine is known to have occasional issues. Components such as the pump, heater, or sensors can fail, triggering warning lights on the dashboard. If left unaddressed, this can lead to the vehicle entering a 'limp home' mode or refusing to start once the countdown expires. While not an epidemic, it is a known weak point to be aware of. Repair costs can range from 500 to 1200 Euros depending on which component requires replacement.
Typical Mileage: 100,000 km
Cost: €500–1200
Buyer's Inspection Checklist
- Check for any AdBlue or emissions-related warning lights on the dashboard.
- Verify the service history to ensure oil changes and AdBlue refills have been performed on schedule.
- Inspect for any signs of oil leaks around the engine cover, although this is less common on this generation.
- Test drive the vehicle to ensure smooth power delivery and no hesitation, which could indicate sensor issues.
Frequently Asked Questions
Is the OM654 engine reliable?
The OM654 has known weak points, but with good maintenance the reliability is solid. See the risk analysis and common problems for specifics. Start a report for a specific car.
How expensive are typical repairs?
Common repairs fall into a mid-range cost band depending on the issue and workshop. Check the cost ranges in the table. Use the used car report for specific listings.
Which model years are best for this engine?
Newer production years often include technical updates. Review the production years and revisions in the specs. Use Car Check for quick screening.
Related Engines
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OM646
Risk Score
2.5
FuelDiesel
Production2002–2010
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Mercedes-Benz
OM656
Risk Score
4.5
FuelDiesel
Production2017–Present
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Mercedes-Benz
OM642
Risk Score
6
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Mercedes-Benz
OM651
Risk Score
6.5
FuelDiesel
Production2008–2020
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