Mercedes-Benz W169 A170 W245 B170 M266 E17 266940 Bare Engine 266.940 WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

Mercedes-Benz W169 A170 W245 B170 M266 E17 266940 Bare Engine is an original powertrain unit from the Mercedes family, designed for A-Class and B-Class models. This used four-cylinder petrol engine provides solid performance parameters and maintains factory driving characteristics. It is a solution for users looking for a proven engine block for professional repair or replacement.

Specifications and technical data

• SKU: A2660100300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2660100300
• Substitutable numbers: A2660100300, A 266 010 03 00, A2660107800, A 266 010 78 00
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 54 000

Purpose and compatibility

The presented engine belongs to the Engines category and is structurally matched to Mercedes A-Class W169 series and B-Class W245 series vehicles in A170/B170 versions. The unit comes from the Mercedes petrol engine range, which means it is compatible with the factory fuel supply, control, and auxiliary systems used in these models.

The four-cylinder layout ensures balanced operation, good running refinement, and predictable behavior under typical urban and extra-urban operating conditions. The engine is suitable both as a replacement in the event of a failure of the existing unit and for planned powertrain upgrades within the same design family.

Construction and technical characteristics

The four-cylinder petrol engine is a classic solution used by Mercedes in compact models, combining reasonable fuel consumption with sufficient dynamics. The cylinder layout promotes even mechanical load distribution, which translates into stable operation across the full rev range.

The unit was designed as a component that works with the factory engine management, cooling, and exhaust systems of these models. This makes it possible to maintain the original performance characteristics of the powertrain without the need for unusual structural modifications.

Practical application and benefits of installation

By installing this powertrain unit in a Mercedes A-Class or B-Class, the user gains:

• Restoration of factory driving characteristics – an engine from the same design family allows for maintaining predictable performance and throttle response.
• Consistency with the original installation – no need to adapt non-standard solutions, which facilitates workshop work.
• Possibility of economical repair – a used engine is often a cost-effective solution compared to a full rebuild of a damaged unit.

The unit will prove useful in situations where the existing engine has suffered serious mechanical damage or an economically unviable failure, and the priority is to restore the vehicle's efficiency while maintaining reasonable costs.

Condition, mileage, and selection verification

The engine comes from the secondary market, which allows for an attractive balance between purchase cost and potential further service life. The declared mileage of the unit is important information when planning further vehicle use and estimating the cost-effectiveness of the installation.

To select the appropriate engine for a specific car, it is recommended to verify compatibility using the VIN and part numbers based on manufacturer catalogs or specialized workshop software. This helps to avoid problems with the compatibility of accessories, wiring harnesses, and control units.

For users who want to approach the purchase of a used powertrain unit consciously, an expert guide describing facts and myths about the secondary market will be useful. A detailed discussion of selection procedures by VIN and part numbers can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths.

Mercedes engines – further expansion and modernization

If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other elements from the same group, such as blocks, cylinder heads, or complete engine blocks, check the available parts in the Mercedes Engines category.

Such an approach allows for planning a more complete scope of work – from replacing the powertrain unit itself, through potentially supplementing missing elements, to modernizing selected components within the same design family.