Mercedes-Benz Vaneo W414 E19 M166 166991 125HP Complete Engine 166.991 WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

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

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

Mercedes-Benz Vaneo W414 E19 M166 166991 125HP Complete Engine is a factory-spec power unit from the M166 family, designed for Vaneo W414 models. This is the ideal solution for users looking for a consistent, original powertrain instead of rebuilding an old engine, while maintaining correct operating parameters and compatibility with factory electronics.

Specifications and technical data

• SKU: A1660104902-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1660104902
• Substitutable numbers: A1660104902, A 166 010 49 02
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Technical characteristics of the M166 unit

The presented engine belongs to the M166 family, which consists of transversely mounted, four-cylinder petrol units used in compact Mercedes models. The use of four cylinders in an inline configuration ensures smooth operation, predictable torque characteristics, and good refinement within typical RPM ranges.

The unit is adapted for petrol fuel, which facilitates operation in urban and suburban conditions, and allows for precise control of the combustion process by the factory fuel injection and ignition system. The rated power of 125 HP provides adequate dynamics for the Vaneo body while maintaining reasonable fuel consumption.

Purpose and compatibility with Mercedes-Benz Vaneo W414

The engine was designed for the Mercedes-Benz Vaneo W414 in the E19 version, ensuring full compatibility with factory mounts, wiring harnesses, accessories, and the engine control unit intended for M166 units. This configuration reduces the need for mechanical and electrical modifications during installation, which translates into shorter vehicle downtime in the workshop.

The M166 166.991 designation indicates a specific design variant within this family, which is important when selecting based on ECU software, accessories, and the exhaust system. As a result, this engine is the right choice when replacing a unit in a Vaneo W414, where maintaining factory operating parameters and proper cooperation with the existing installation is a priority.

Condition, mileage, and use in repairs

The unit comes from the Engines category and is offered as a used component, which allows for a significant reduction in repair costs compared to purchasing a new powertrain. The declared mileage is essential information for workshops and users planning long-term operation – it allows for assessing the engine's remaining potential and selecting the appropriate scope of service activities after installation (replacement of fluids, filters, spark plugs, and inspection of seals).

This type of complete engine is suitable both for standard unit replacement after a mechanical failure and for more complex renovation projects where component consistency and maintaining the original vehicle specification are key. A used power unit is also a beneficial solution for fleets and workshops specializing in servicing Mercedes models, where repeatability and predictability of parameters are valued.

Benefits of choosing an original Mercedes engine

Choosing an original M166 family engine for the Vaneo W414 means maintaining factory mounting geometry, correct support point positioning, and compatibility with the cooling and intake systems. As a result, installation proceeds in an orderly manner, and the risk of fitment issues with associated components is minimized.

For workshops and users, it is also important that the unit was designed specifically for this model, which facilitates diagnostics, ECU programming, and subsequent maintenance. Using a complete engine instead of a deep repair of a damaged unit often shortens repair time and allows for better control over the total project cost.

OEM selection and expert knowledge

When selecting a used engine for a specific Vaneo vehicle, matching it by OEM number and M166 variant designation is crucial. Properly pairing the unit with the vehicle's installation minimizes the risk of starting problems, ECU errors, or improper accessory operation. It is recommended to use VIN and OEM selection procedures to ensure that the ordered engine matches the factory configuration of the car.

If you want to better understand how to safely buy used power units and what to look for when verifying condition, selecting by numbers, and calculating repair costs, check out our guide Why it is worth buying used gearboxes and engines – facts instead of myths, where you will find practical tips and examples.

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