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Mercedes-Benz OM611 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The OM611 is Mercedes-Benz’s first-generation common-rail diesel (CDI), a 2.1-litre to 2.2-litre inline-4 fitted to the W203 C-Class, W210/W211 E-Class, and light commercial vans. Reconditioned OM611 engines typically start from £2,500 , serving as a robust, efficient upgrade over the older pre-chamber diesels for classic and high-mileage hosts.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£1,200
Reconditioned from
£2,500
Rebuilt from
£3,500
GB
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Key Specs
Mercedes-Benz OM611 - Specifications at a Glance
Engine Code
OM611 (including OM611.940, OM611.950, OM611.960)
Fuel
Diesel
Configuration
2.1L-2.2L inline-4, DOHC, 16-valve, common-rail (CDI)
Power Output(s)
75 kW (102 hp) - 110 kW (150 hp)
Years Produced
1998-2006
UK Models Fitted
4 Mercedes model families - full list in Compatibility below
Replaced
OM604
Replaced By
OM646
Most Common Failure
Swirl flap actuator failure and injector seal weeping
Reconditioned Price Range
£2,500-£4,200 supply-only
Vetted UK specialists for OM611 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Mercedes Models Use the OM611-
The OM611 was the pioneering CDI engine for Mercedes-Benz, replacing the older pre-chamber units and bringing common-rail efficiency, lower emissions, and improved refinement to the compact and mid-size saloon range, as well as light commercial vehicles.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Mercedes-Benz C-Class | W203 | C 200 CDI, C 220 CDI | 2000-2006 | |
| Mercedes-Benz E-Class | W210 | E 200 CDI, E 220 CDI | 1998-2002 | |
| Mercedes-Benz E-Class | W211 | E 200 CDI, E 220 CDI | 2002-2006 | |
| Mercedes-Benz Sprinter | 903 / 904 / 906 | 208 CDI, 211 CDI, 213 CDI, 216 CDI | 1998-2006 |
02
Mercedes-Benz E-Class
03
Mercedes-Benz E-Class
04
Mercedes-Benz Sprinter
Generation/Chassis
903 / 904 / 906
Badge(s)
208 CDI, 211 CDI, 213 CDI, 216 CDI
Years
1998-2006
Link
CROSS-BRAND
OM611 is documented across 4 BMW applications spanning C-Class, E-Class, Sprinter. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact OM611 fitment before any quotes are sent.
Prices
Mercedes-Benz OM611 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £1,200-£2,500 | £1,800-£3,400 | 3-6 months |
Reconditioned | £2,500-£4,200 | £3,300-£5,100 | 12-24 months |
Rebuilt | £3,500-£5,500 | £4,500-£6,600 | 12-24 months |
What genuinely moves the price for this engine is the condition of the swirl flap actuator, injector seals, and turbocharger (on .960 variants). Because the OM611 was Mercedes’ first CDI, recon specialists often upgrade the swirl flap system to a more reliable aftermarket unit or perform a verified delete, alongside replacing all injector seals as standard. For a full breakdown of market rates, see our full reconditioned engine cost guide.
Labour Guide
Fitting an OM611 engine typically takes 8-12 hours at £65-£85/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Mercedes-Benz OM611 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the OM611, based on real-world data and verified failure patterns.
Verified issue focus: Swirl flap actuator failure and injector seal weeping.
1. Swirl Flap Actuator Failure - All variants, especially .940 and .950
1. Swirl Flap Actuator Failure - All variants, especially .940 and .950
Typical onset:
80,000-120,000 miles
What happens:
The plastic gears inside the electronic swirl flap motor strip over time, causing the ECU to throw a check engine light and default the engine to limp mode. In some cases, the flaps themselves can seize in the inlet manifold.
Repair vs replace:
The actuator motor can be replaced independently and relatively cheaply. However, if the flaps are seized or the manifold is heavily carboned, a full inlet manifold replacement is required.
Read more about this issue
2. Injector Seal Weeping ("Black Death") - All variants
2. Injector Seal Weeping ("Black Death") - All variants
Typical onset:
100,000+ miles
What happens:
The copper washer seals at the base of the injectors degrade, allowing high-pressure combustion gases to escape. This creates a black, crusty carbon buildup around the injector heads, leading to a distinct tapping noise, rough idling, and a strong smell of exhaust in the cabin.
Repair vs replace:
This is a routine maintenance item, not a terminal failure. Replacing the seals and cleaning the cylinder head is inexpensive and should be done preventatively.
Read more about this issue
3. Timing Chain and Guide Wear - High-mileage units
3. Timing Chain and Guide Wear - High-mileage units
Typical onset:
150,000+ miles
What happens:
While more robust than later N47 designs, the OM611 timing chain and plastic guide rails can still stretch and wear at very high mileages, leading to a rattling noise on cold starts.
Repair vs replace:
If caught early, a timing chain and guide kit replacement is straightforward. If ignored, it can jump a tooth, causing valve-to-piston contact and requiring a full engine replacement.
Read more about this issue
The OM611 is widely regarded as a significant reliability step up from the OM604 pre-chamber engine it replaced. Units maintained with regular oil changes and timely injector seal replacements routinely exceed 250,000 miles without major internal issues .
Compare rebuilt OM611 engine prices with the failure already addressed
Engine Variants
OM611 Sub-Codes Explained - Which One Is in Your Car-
INTRO: The OM611 family shares the same fundamental common-rail block and head design, but displacement, turbocharging, and calibration vary depending on the chassis. Identifying your exact sub-code ensures you order the correct injection pump, turbo, and ancillary components. - Fitted to: C-Class W203 (C 200 CDI), E-Class W210 (E 200 CDI) - Key technical difference: The entry-level variant, featuring a smaller 2151cc displacement and a simpler, lower-boost turbocharger setup (or naturally aspirated in very early W210 applications). - Sub-code-specific failure note: Shares the family failure pattern above; swirl flap actuator failure is highly prevalent on this specific tune. - Interchange note: Not a straight swap with the .960 turbo variants; the injection pump, ECU mapping, and turbo plumbing differ significantly. - Fitted to: E-Class W211 (E 220 CDI), CLK-Class W209 (CLK 220 CDI) - Key technical difference: Increased displacement to 2148cc for better mid-range torque, making it the preferred choice for the heavier W211 E-Class chassis. - Sub-code-specific failure note: Shares the family failure pattern above. - Interchange note: Requires matching injection pump and ECU; the sump, oil pickup, and engine mounts differ between the W211 and W209 applications. - Fitted to: E-Class W211 (E 220 CDI high-output), Sprinter 903/904/906 (213 CDI, 216 CDI) - Key technical difference: Higher boost pressure, upgraded intercooler, and commercial-grade ancillary brackets designed for the heavier load demands of the Sprinter van range. - Sub-code-specific failure note: Shares the family failure pattern above; turbocharger actuator wear and EGR clogging are more prevalent on this variant due to higher boost loads and commercial duty cycles. - Interchange note: Passenger car and Sprinter versions share the core block architecture, but the oil pickup, sump, and accessory drives are application-specific and not directly interchangeable without significant modification.
The engine code is stamped on the right-hand side of the cylinder block, just above the oil filter housing. It will also be listed on your V5C logbook under "Engine Capacity" or visible via a VIN decode. Not sure- Enter your registration above for instant confirmation.
Easily Confused
OM604
the older pre-chamber diesel that the OM611 replaced, offering a significant step up in refinement, efficiency, and emissions with its pioneering common-rail architecture.
Alternative / Next-Gen Code
OM646
the direct evolution of the OM611, featuring refined common-rail injection, improved emissions compliance, and slightly higher outputs for the W211 E-Class and W209 CLK chassis.
Related JLR Variants
OM612
the 5-cylinder derivative of this architecture, sharing the same common-rail philosophy but offering more displacement and torque for heavier chassis applications.
Confirm the exact OM611 fitment
The engine code is stamped on the right-hand side of the cylinder block, just above the oil filter housing. It will also be listed on your V5C logbook under "Engine Capacity" or visible via a VIN decode. Not sure- Enter your registration above for instant confirmation.
Buying Guide
Buying a Replacement OM611 Engine - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used OM611 engine makes sense only if it comes with verifiable service history and documented replacement of the swirl flap actuator and injector seals. Given the age of these vehicles, the primary risk is hidden carbon buildup or degraded rubber components, so a compression test is mandatory before purchase.
Reconditioned:
A proper reconditioned OM611 engine is the sweet spot for most buyers. A reputable rebuild will address the common failure points by upgrading or replacing the swirl flap system, fitting new injector seals, and refreshing the timing chain and guides, giving the engine a fresh lease on life.
Rebuilt:
A full OM611 engine rebuild is justified for high-mileage Sprinter commercial vans or classic W210/W211 E-Class restorations where originality and maximum longevity are required. An upgraded rebuild should include line-boring the block, new pistons/rings, and a balanced crankshaft.
Supply & Fit Line:
Sourcing and fitting through our vetted network ensures your OM611 engine is installed by specialists familiar with early Mercedes CDI systems, backed by a nationwide warranty.
Vehicle Value Note:
Because the OM611 is typically found in W203, W210, W211, and early Sprinter vehicles valued between £1,500 and £6,000, a full replacement can represent a significant portion of the host's worth. If the lowest viable replacement cost exceeds approximately 60% of the vehicle's current market value, evaluate scrap value before committing .
Compare OM611 Engine Prices Now
Related Engines
Engines Related to the Mercedes-Benz OM611
Explore engines that are closely related to the Mercedes-Benz OM611, including its predecessor, successor, and key family variants.
Predecessor
OM604
the older pre-chamber diesel that the OM611 replaced, offering a significant step up in refinement, efficiency, and emissions with its pioneering common-rail architecture.
Successor
OM646
the direct evolution of the OM611, featuring refined common-rail injection, improved emissions compliance, and slightly higher outputs for the W211 E-Class and W209 CLK chassis.
Sibling
OM612
the 5-cylinder derivative of this architecture, sharing the same common-rail philosophy but offering more displacement and torque for heavier chassis applications.
FAQ
Mercedes-Benz OM611Frequently Asked Questions
Question 1How much does a Mercedes OM611 engine replacement cost-
A reconditioned Mercedes OM611 engine typically costs between £2,500 and £4,200 for supply only . Fitted costs generally range from £3,300 to £5,100 depending on the specialist, while used units can be found from £1,200 but carry higher risk due to the engine's age and mileage. Compare OM611 engine replacement quotes today
Compare OM611 quotesQuestion 2What is the most common failure on the OM611 engine-
The most documented issues are swirl flap actuator failure, injector seal weeping ("Black Death"), and timing chain guide wear at high mileage. Swirl flap motor failure triggers limp mode and is a routine fix, whereas injector seal failure causes black carbon buildup and rough idling but is a cheap and preventative maintenance item. Get quotes for a rebuilt OM611 with these issues resolved
Compare OM611 quotesQuestion 3Which Mercedes models use the OM611 engine-
The OM611 was fitted to the W203 C-Class (C 200 CDI, C 220 CDI), the W210 and W211 E-Class (E 200 CDI, E 220 CDI), and the first-generation Sprinter vans (208 CDI, 211 CDI, 213 CDI, 216 CDI), serving as Mercedes' pioneering CDI diesel. Check your registration to confirm your exact OM611 fitment
Compare OM611 quotesQuestion 4Should I buy a used or reconditioned OM611 engine-
A reconditioned OM611 is strongly recommended over a used unit. A proper rebuild will proactively address the common failure points by upgrading or replacing the swirl flap system, fitting new injector seals, and refreshing the timing chain and guides, whereas used engines often hide stretched chains and carboned manifolds. Compare reconditioned OM611 engine prices from UK specialists
Compare OM611 quotesQuestion 5What is the difference between OM611.940, .950, and .960-
The OM611.940 is the 2.1L entry-level variant, the OM611.950 is the 2.2L naturally aspirated version with a longer stroke for higher low-end torque in heavier cars, and the OM611.960 is the 2.2L turbocharged variant requiring a higher-capacity mechanical injection pump and upgraded cooling for commercial van applications. Enter your reg above to identify your exact OM611 sub-code ═══════════════════════════════════════
Compare OM611 quotesCompare Mercedes-Benz OM611 Engine Prices Today
Vetted UK specialists who work on early Mercedes CDI systems like the OM611 every week Minimum 12-month warranty on every reconditioned and rebuilt OM611 engine Nationwide delivery - supply-only or full supply & fit available across the UK Get a free, no-obligation comparison of OM611 engine prices tailored to your exact sub-code. Our registration lookup confirms your fitment before any quotes are sent, ensuring you receive the correct unit with matching ancillary components. With reconditioned OM611 engines starting from an estimated £2,500, comparing takes two minutes and could save you hundreds on labour and unexpected parts.
Vetted UK Specialists
Vetted UK specialists for OM611 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
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