BMW 1 3 Series E87 E90 116i 316i N45 Engine Wiring Loom Harness 7545162 7549243

The BMW 1 3 Series E87 E90 116i 316i N45 Engine Wiring Loom Harness is an original engine wiring harness designed for the N45 unit in BMW 1 Series E87 and 3 Series E90 models. It is an item from the Other category, crucial for correct communication between the engine control unit and sensors/ancillaries. A used, factory harness is a practical solution for electrical system repairs or replacing a damaged factory engine wire.

Specifications and technical data

• SKU: rhd-7545162
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7545162
• Substitutable numbers: 12517549243, 7549243, 12517540095, 7540095, 12517540092, 7540092, 12517545162, 7545162
• Category: Other Engine Parts

Purpose and Compatibility

The presented engine harness is designed to work with the N45 gasoline engine in BMW 1 Series E87 116i and 3 Series E90 316i models. It is responsible for connecting sensors, injectors, ignition coils, and other ancillary components to the control unit, ensuring stable powertrain operation.

Thanks to its factory OEM design, the harness maintains correct wire lengths, connector placement, and mounting points, which facilitates installation in the engine bay without requiring modifications to the existing wiring.

Construction and Function of the N45 Engine Harness

The engine harness in this BMW model forms an extensive network of wires and connectors that:

• transmits signals from sensors to the engine control unit,
• supplies power to actuators,
• ensures communication between modules responsible for powertrain operation.

Appropriately selected wire gauges and shielding of individual sections minimize interference and support the stable operation of the ignition and injection systems. A correctly selected engine harness is particularly important when resolving issues with starting, misfires, or sensor errors.

Application in BMW Service and Repairs

Replacing the complete engine harness is often a more predictable solution than spot soldering or fabricating wire sections. For BMWs with the N45 unit, this allows for:

• restoring the factory wiring run in the engine bay,
• minimizing the risk of chafing and short circuits resulting from improper wire routing,
• simplifying diagnostics – the service works with the original connection system.

A used OEM harness is particularly attractive for repairing daily-driven vehicles where reasonable service costs are important while maintaining correct functionality.

Benefits of Using an Original BMW Harness

Using a factory engine harness in BMW 1 and 3 Series with the N45 unit offers a range of practical benefits:

• Full compatibility with the factory installation – correct connectors, wire lengths, and mounting points.
• Reduction of engine electrical problems resulting from previous makeshift repairs.
• Easier installation compared to universal solutions or self-made harnesses.

For workshops specializing in BMWs and DIY mechanics, this is a component that allows for restoring correct powertrain operation without altering the manufacturer's installation design.

Other Parts and Technical Knowledge

If you are looking for other products from the Other category dedicated to this brand, check out our offer at BMW Other Parts, where you will find a wide selection of installation components, ancillaries, and service accessories.

For a comparison of solutions used in sporty versions of other brands, including advanced powertrains and associated systems, it is worth reading the blog article Audi RS vs Other Models – What Lies Under the Hood and Chassis?, which discusses structural differences in engines, brakes, and chassis and their impact on spare part selection.