BMW E70 LCI E90 E91 LCI F10 F11 N57 Lead Preheater Wiring System Diesel 7800167

BMW E70 LCI E90 E91 LCI F10 F11 N57 Glow Plug Wire is an original component of the diesel engine's electrical system, designed for Diesel N57 units in selected BMW models. It ensures stable power supply to the glow plugs, which translates to reliable starting and proper operation of the pre-heating system under difficult operating conditions.

Specifications and technical data

• SKU: 7800167
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7800167
• Substitutable numbers: 7800167, 12427800167, 24007644022, 7644022, 24007630574, 7630574, 24007644213, 7644213, 24007607738, 7607738
• Fuel type: Diesel
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Role in the Glow Plug Supply System

The glow plug wire in the N57 engine is responsible for the direct, controlled delivery of voltage to the glow plugs, working in conjunction with the control module and the vehicle's main wiring harness. In BMW diesel engines, the correct condition of this wire is crucial for:

• efficient cold engine starting,
• stable operation during the warm-up phase,
• reducing smoke and uneven idling,
• decreasing the load on other electrical system components.

Replacing a worn or damaged wire with an original part from the Wires, Harnesses, and Connectors group allows for the restoration of the correct operating characteristics of the glow plug system without altering the engine's construction.

Construction, Compatibility, and Performance Parameters

The offered glow plug wire is part of the system dedicated to BMW Diesel engines from the N57 family, installed in series such as E70 LCI, E90, E91 LCI, F10, and F11. Using an original harness means:

• factory-matched length and routing geometry of the wire,
• connection points to glow plugs and the main harness designed for the specific engine,
• appropriately selected wire cross-sections for the current loads typical of the glow plug system,
• compliance with original BMW electrical schematics.

This ensures that installation requires no modifications, soldering, or adaptations – the wire operates under conditions intended by the manufacturer, which reduces the risk of overheating, voltage drops, or localized insulation damage.

Benefits of Using an Original BMW Wire

Using an original glow plug wire in the N57 engine brings tangible operational benefits:

• Stable starting in low temperatures – proper power supply to the glow plugs shortens the combustion chamber warm-up time.
• Protection of the control module – correct electrical parameters of the harness reduce the risk of overloads and errors in the glow plug controller.
• Improved engine running smoothness during the warm-up phase, leading to reduced vibrations and even mixture combustion.
• Maintenance of compatibility with the original BMW electrical system, facilitating diagnostics and servicing.

This solution is particularly recommended for issues with difficult starting, appearing glow plug system errors, or after replacing the glow plugs themselves when the supply system no longer provides adequate parameters.

Condition, Installation, and Service Application

This component comes from the used BMW parts group, allowing for economical repair while maintaining the original manufacturer's specifications. The glow plug wire is designed for direct installation in the N57 engine, utilizing factory mounting points and harness routing.

In workshop practice, this type of wire is most often replaced:

• when circuit interruptions to the glow plugs are detected,
• in case of local mechanical or thermal damage to the insulation,
• prophylactically – along with the replacement of the complete set of glow plugs in engines with higher mileage.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as power harnesses, connectors, or signal wires, check the available parts in the BMW Wires, Harnesses, and Connectors category.

For drivers interested in a broader perspective on upgrades and selecting parts for high-performance cars, an article describing the structural changes and component selection in a popular hot hatch might be helpful – find more information in the material Hot Hatch Legend: The Evolution of the VW Golf GTI from Mk1 to Mk8 – Structural Changes and VW Car Parts.