EGR Cooler BMW E81 E88 E90 E93 Diesel N47 Engine EGR Exhaust Cooler 7797371

EGR Cooler BMW E81 E88 E90 E93 Diesel N47 Engine EGR Exhaust Cooler is an original exhaust gas recirculation system component designed for BMW N47 diesel engines. Thanks to its factory-spec design, it ensures proper exhaust gas cooling, stable engine operation, and compliance with emission standards during daily use.

Specifications and technical data

• SKU: 7797371-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797371
• Substitutable numbers: 11717797371, 7797371, 7801942, 11717801942
• Fuel type: Diesel
• Category: EGR Parts & Valves

Purpose and function in the EGR system

The EGR cooler and valve in a diesel engine are responsible for the controlled return of a portion of exhaust gases to the intake manifold and cooling them before they are reintroduced into the cylinder. In N47 units, this is crucial for:

• lowering combustion temperatures and reducing nitrogen oxides,
• maintaining stable engine performance across the entire load range,
• reducing wear on combustion chamber components and accessories.

Selecting the correct EGR module for a specific generation of BMW 1 Series, 3 Series, or other models with the N47 engine allows you to maintain consistency with the factory engine control unit calibration and avoid OBD diagnostic issues.

Benefits of using an original BMW component

The offered cooler with the exhaust valve belongs to the EGR valves and parts group, meaning it was specifically designed to operate in the demanding environment of high temperatures and variable exhaust flow. In practice, this translates into:

• precise control of exhaust flow through the recirculation system,
• properly sized heat exchange surface in the cooler,
• compatibility with factory sensors and diesel engine accessories.

Thanks to the preservation of the original exhaust channel geometry and connection ports, installation is straightforward, with no need for system modifications.

Technical characteristics and installation

The component is designed to work with Diesel engines, where the EGR system operates under significant thermal load. The design of the cooler and valve accounts for:

• resistance to cyclic temperature and exhaust pressure changes,
• tightness of connections with the intake and exhaust systems,
• the ability to properly bleed the cooling system after installation.

During replacement, it is recommended to perform a computer diagnostic of the EGR system and an adaptation, so the engine control unit correctly recognizes the operation of the newly installed component and does not generate exhaust flow-related errors.

Condition, cost-effectiveness, and use of the pre-owned part

The offered item is in Used condition, which allows for a significant reduction in repair costs compared to a new OEM component, while maintaining factory design and fitment. For many BMW N47 engine users, this is a reasonable compromise between quality and service budget, especially during comprehensive work on the intake and exhaust systems.

If you want to better plan your repair budget and understand when choosing a used OEM component makes the most sense, it is worth checking out our guide: Rising repair costs and the boom in used parts – how to save on car maintenance?.

Expanding the EGR system in your BMW

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 exhaust coolers, control valves, or recirculation pipes, check out the available parts in the BMW EGR valves and parts category.