Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661503133

The Mercedes W169 W245 M266 Engine Wiring Harness is an original part from the Cables, Harnesses, and Connectors group, designed for M266 gasoline-powered engines. This used, factory harness ensures proper connection of all sensors, actuators, and the engine control unit, contributing to stable powertrain operation.

Specifications and technical data

• SKU: A2661503133
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661503133
• Substitutable numbers: A2661503133, A 266 150 31 33
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Intended Use and Function in the Engine System

The presented engine wiring harness is dedicated to Mercedes A-Class W169 and B-Class W245 models with the M266 gasoline engine. It is responsible for transmitting signals between the control unit, sensors, and actuators, such as the ignition system or fuel supply components, which is crucial for correct engine control.

Thanks to its factory fit for the specific M266 engine architecture, the harness maintains the correct cable lengths, connector placement, and appropriate electrical insulation. This helps avoid issues with stretched wires, accidental insulation abrasion, or installation errors typical of universal solutions.

Construction, Connectors, and Technical Aspects

This harness belongs to the Cables, Harnesses, and Connectors category, meaning it includes a set of signal and power wires with factory connectors matched to the M266 engine's accessories. The design features appropriate branching to individual sensors and actuators, maintaining the correct pin order and shielding where required by the manufacturer.

The connector layout is designed for the specific W169 and W245 body styles, facilitating the routing of the harness in the engine bay according to original installation paths. Appropriately selected wire gauges and insulation materials support stable electrical parameters under typical vehicle operating conditions.

Benefits of Using an Original Used Harness

Using an original, used engine wiring harness helps maintain compliance with factory service documentation and Mercedes electrical schematics. This is particularly important for computer diagnostics, where correct circuit and pin assignments directly impact the reliability of readings and the effectiveness of repairs.

The main advantages of this solution include:

• factory fit for the M266 engine and W169/W245 bodies,
• preservation of the original wire routing geometry in the engine bay,
• compatibility with gasoline-powered accessories,
• the ability to restore correct electrical system operation after mechanical or thermal damage to the old harness.

Installation and Service Application

The engine wiring harness in this application is a typical service part used for repairs following overheating, collisions, or electrical system interventions. Thanks to the preservation of the original connector configuration, installation can be performed in a near plug-and-play manner, utilizing factory mounting points and brackets in the engine bay.

Before installation, it is recommended to verify compatibility with your specific M266 engine variant and thoroughly inspect the condition of the connectors and insulation. A correctly selected harness helps reduce the risk of circuit interruptions, sensor signal interference, and engine starting problems, leading to more predictable vehicle operation.

If you are planning comprehensive service of the electrical system in the engine bay and also need other parts from the range of cables and connectors dedicated to this brand, check the available parts in the Mercedes Cables, Harnesses, and Connectors category.

For users who are simultaneously servicing the thermal comfort systems in their vehicles and want to better understand the selection of original components and maintenance schedules, the guide article Air Conditioning and Heating – Part Selection and Maintenance for Year-Round Comfort may be helpful.