BMW 1 3 Series F20 F21 F30 E31 LCI Diesel Oxygen Sensor Exhaust Lambda 8573155

BMW F20 F21 F30 E31 LCI Diesel Lambda Sensor is an original part from the Lambda Sensors and O2 Sensors category, designed for BMW diesel engines. It serves as a precise exhaust gas composition sensor in modern diesel units, ensuring stable injector system operation and correct fuel-air mixture control. This is a solution for users who want to restore correct engine operating parameters without investing in a new part.

Specifications and technical data

• SKU: 8573155
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8573155
• Substitutable numbers: 13628573155, 8573155
• Fuel type: Diesel
• Category: Oxygen Sensors

Application and Function in the Exhaust System

The BMW lambda sensor for diesel engines is responsible for measuring oxygen content in exhaust gases and transmitting the signal to the engine control unit. Based on this data, the ECU corrects the fuel dose, which affects:

• stable operation of the power unit across the full load range,
• maintenance of correct exhaust emission parameters,
• reduction of smoke and power loss,
• protection of exhaust system components, including the particulate filter.

Thanks to the correct operation of the sensor, the engine control system can react to changes in driving conditions, which translates into more predictable car behavior and better refinement of the diesel unit.

Compatibility with BMW Models and Selection by Numbers

The presented lambda sensor has been designed for selected BMW models of the F20, F21, F30 series, and E31 LCI (facelift) versions with diesel engines. This means it is tailored to the specific generation of the exhaust system and engine control characteristic of these models. Part selection should be based on:

• the OEM part number assigned to a specific engine variant,
• interchangeable numbers provided by the manufacturer,
• data from the catalog based on the vehicle's VIN.

This approach minimizes the risk of installation problems and incompatibility of the sensor's electrical and software parameters with the given engine control unit.

Technical Characteristics and Installation Benefits

The lambda sensor in this offer belongs to the group of measuring elements dedicated to Diesel fuel systems, where it operates under demanding temperature and pressure conditions. The OEM design ensures:

• correct fit of the thread and electrical connector to the factory wiring harness,
• correct signal characteristics for the BMW engine control unit,
• possibility of installation in place of the factory sensor without any wiring modifications.

In practice, this means plug-and-play installation at the point designated by the manufacturer in the exhaust system, maintaining the original geometry and seal of the connection. A properly selected O2 sensor allows for the restoration of correct fuel dose corrections, which often resolves issues with uneven engine operation, increased fuel consumption, or the illuminated engine error light.

Used Condition – Informed Choice in Engine Control System

The offered lambda sensor is a used part, which represents a reasonable compromise between repair cost and maintaining the original manufacturer's specifications. For sensors in the Lambda Sensors and O2 Sensors category, choosing a used part makes sense, especially when it comes from the same engine family and vehicle generation. This allows for cost savings while maintaining the system's factory operating parameters.

To better understand when it is worth opting for used sensors and engine electronics, it is recommended to read the guide: Used Car Electronics – Why ECU Modules and Second-Hand Sensors Make Sense. You will find practical tips on selection by OEM numbers, hardware and software compatibility, and installation.

Other BMW Lambda Sensors and O2 Sensors

If you are also looking for other BMW Lambda Sensors and O2 Sensors for different models or engine configurations, check out our dedicated category: BMW Lambda Sensors and O2 Sensors. With filters by brand and parameters, you can easily select the right sensor for your vehicle.