C 220 d OM651
The four-cylinder diesel that carried Mercedes for a decade. Durable bottom end; the money is in the injectors, and early piezo units are the reason some of these cars are cheap.
Overview
The C 220 d is the OM651 diesel version of the Mercedes-Benz C-Class sedan (W205), sold 2014–2018 with 170 PS and manual or automatic. Manageable at level 2. This later OM651 sits after the injector and chain revisions, so the emissions hardware is the main cost. 3 failure modes are recorded against its engine, gearbox, chassis and shared components. Prices on this page are illustrative placeholders rather than a sourced market sample. See the methodology for how the bands are derived.
Mercedes-Benz C-Class sedan (W205) · photo 0 Mercedes-Benz W205 (2018) 1 by Benespit · CC BY-SA 4.0 · Wikimedia Commons
Ranked by probability × repair cost. 3 recorded in total.
- DPF clogging and forced regeneration
- 7G-Tronic conductor plate and 13-pin connector leak (722.9)
- EGR cooler leak
Risk level −11 · Likely spend vs price −7 · all issues →
Pre-facelift or facelift, this engine spans both
The same badge either side of the changeover. Bands are split at the facelift year from the generation record.
| Phase | Years | Low | Average | High | Good buy | What differs |
|---|---|---|---|---|---|---|
| pre Pre-facelift | 2014–2017 | €11,000 | €15,500 | €22,000 | €13,250 | The specification the car launched with. |
| LCI Facelift (LCI) | 2018 | €12,000 | €16,900 | €24,000 | €14,450 | OM654 and M264 engines replaced OM651 and M274; Revised lights and bumpers; Digital instruments available |
Known issues, ranked by expected cost
Faults recorded against this engine, its components and its chassis, ranked by likelihood × repair cost. Costs are indicative ranges with a stated labour basis.
Ranked by probability × repair cost, not by how loudly a failure is discussed. Inherited from the engine, gearbox, chassis and shared components, each written once.
Pre-purchase inspection
The same issue records, reordered into the sequence you can actually check them in: cold start, static, drive, paperwork.
1On the driveInclude low-speed manoeuvring, not just an open road.
2PaperworkOn these cars the folder is most of the value.
3OBD scanMandatory. A seller who refuses a scan has answered the question.
Mileage and servicing
What the odometer does and doesn't tell you here, plus the service items whose neglect causes the expensive failures above.
These cover motorway distance happily and a 200,000 km car with a full record is a sound buy. Short-trip history is what hurts them, so ask about the daily run.
| Service item | Interval | Cost |
|---|---|---|
| Engine oil and filter Low-ash oil protects the filter, and the chain still likes regular changes. | 15,000 km or annually | €140–210 |
| Gearbox oil and filter Both automatics last longer with fresh oil than the schedule implies. | every 60,000–100,000 km | €300–450 |
What to pay
What this engine sells for, against the median of every engine in the chassis. All figures are illustrative placeholders. See the basis chips.
Enter an asking price to get a verdict against this variant's band: cheap, fair, good buy or overpriced.
United States vs Europe
1 EUR = 1.08 USD ·US figures are the EU band converted at a stated rate. No US market differential is modelled: we hold no sourced US asking prices, and inventing one would be worse than saying so. What the comparison does show for real is availability. Most of this range was never sold in the US.
- ModelMercedes-Benz C-Class C 220 d
- ChassisW205
- EngineOM651
- Years2014–2018
- MarketCentral EU
- Windowrolling 12 months to 2026-07
Good buy isn't the same as cheapest. The good-buy figure assumes the known failure items are either done with receipts or verifiably not yet due. Full breakdown by facelift phase →
Buyer notes
Our judgement, kept separate from the records it's built on.
Everything above this line comes from the issue and specification records. This paragraph is our judgement on top of them. See how we reach it.
Full specification
Manufacturer figures for this engine and body, as recorded in the variant and engine data.
| Engine code | OM651 2.1 CDI |
| Configuration | I4, turbocharged · 2143 cc |
| Fuel / injection | diesel · common rail |
| Model years | 2014–2018 |
| Facelift phase | Sold either side of the 2018 facelift, 2014–2017 pre, 2018 LCI |
| Power / torque | 170 PS · 400 Nm |
| Transmissions | 6-speed manual · 7-speed automatic (7G-Tronic) · 9-speed automatic (9G-Tronic) |
| Gearbox families | Mercedes 7G-Tronic seven-speed automatic (722.9) · Mercedes 9G-Tronic nine-speed automatic (725.0) |
| Drivetrain | RWD · 4MATIC |
| Economy (real-world) | 4.3–5.5 l/100 km mixed |
| Markets | EU |