BMW X5 E70 E90 LCI E92 F10 Preheating Control Glow Plug Unit Diesel N57 7800156

Visual condition of the part

The product shows signs of use visible in the photos.

BMW X5 E70 E90 LCI E92 F10 Preheating Control Glow Plug Unit Diesel N57 is an original heating system component for BMW diesel engines, responsible for precise control of glow plug operation. The module works with the engine control unit, ensuring stable diesel engine starts in low temperatures and proper operation during the warm-up phase. This solution is dedicated to BMW vehicles with the N57 engine, designed for reliability and compatibility with the factory installation.

Specifications and technical data

• SKU: 8591724
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8591724
• Substitutable numbers: 12218591724, 8591724, 12217800156, 7800156, 780015605
• Fuel type: Diesel
• Category: Glow Plugs

Purpose and function of the glow plug control unit

The glow plug control unit in a BMW diesel engine is responsible for controlling the timing and intensity of the glow for each plug, depending on engine temperature, ambient conditions, and engine load. A properly functioning module:

• facilitates cold diesel engine starts,
• stabilizes engine operation in the first minutes after startup,
• reduces smoke and uneven idling,
• supports the maintenance of proper exhaust emission parameters.

Thanks to its factory design intended for the N57 engine, the module works with the original engine control unit software, which promotes seamless integration with the vehicle's electrical system.

Benefits of using an original BMW module

Using an original glow plug control unit in a BMW E90 or F10 allows you to maintain the consistency of the entire fuel and engine control system. In practice, this means:

• factory fitment for the electrical harness and mounting points,
• operating parameters consistent with the manufacturer's specifications,
• no need for electrical modifications or mechanical adaptations,
• reduced risk of engine control unit errors related to incorrect communication.

For the user, this translates into more reliable diesel engine starts, especially during the autumn and winter seasons, and a reduction in the risk of warning lights related to the heating system appearing.

Operating characteristics in diesel engines

In diesel engines, the glow plug system is crucial for operational comfort. The BMW glow plug control unit:

• controls voltage and glow duration in a sequential manner,
• adjusts parameters to the current coolant and intake air temperature,
• can perform post-start heating, improving cold-start refinement.

A properly selected module for the N57 engine helps maintain stable combustion parameters, which is important for both engine durability and fuel economy.

Condition, installation, and compatibility

The offered control unit comes from the Glow plugs category, meaning it is a component directly related to the combustion chamber heating system. The product is used, which in the case of original BMW components often represents a reasonable compromise between cost and maintaining factory build quality. The module is intended for installation in BMW vehicles with a diesel engine, particularly in E90 and F10 series models equipped with the N57 unit.

Thanks to the OEM design, installation usually comes down to replacing the component in the existing location, using factory connectors and mounting points. After installation, it is recommended to verify the system with computer diagnostics to confirm correct communication with the engine control unit.

Why choose a used OEM module

In the case of diesel engine heating system control units, choosing a used OEM component is often more cost-effective than installing a replacement with uncertain parameters. The original BMW module was designed specifically to work with the N57 engine, which reduces the risk of compatibility issues. If you want to better understand when a used original part is a better choice than a replacement, check out the article 5 reasons why a used OEM part is a better choice than a replacement.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as controllers, control modules, or heating system components, check out the available parts in the BMW Glow plugs category.