NOx Sensor BMW E81 E87 LCI E90 E91 E92 Exhaust Petrol N43 7580517 7587127

NOx Sensor BMW E81 E87 LCI E90 E91 E92 Exhaust Petrol N43 is an original BMW exhaust system component designed for petrol engines. As a specialized NOx sensor and lambda probe, it is responsible for the precise measurement of exhaust gas composition, supporting the proper operation of the engine control unit and maintaining stable emission parameters.

Specifications and technical data

• SKU: 7580517
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7580517
• Substitutable numbers: 7580517, 11787580517, 7587130, 11787587130, 7576907, 11787576907, 7571263, 11787571263, 7587127, 11787587127, 7582326, 11787582326
• Fuel type: Petrol
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The presented NOx sensor and lambda probe operates in the exhaust stream, monitoring nitrogen oxide content and the air-fuel ratio. Based on signals from this component, the engine control unit adjusts the fuel dose, ignition timing, and exhaust treatment strategy, which helps maintain stable power, smooth throttle response, and compliance with emission standards.

In BMW E81, E87 LCI, E90, and E91 series vehicles, the use of a dedicated NOx sensor integrated with a lambda probe is particularly important for city driving, where frequent changes in engine load require a fast and repeatable response from the control system.

Benefits of using an original NOx sensor / lambda probe

Using the correct component from the Lambda probes and O2 sensors group translates into tangible operational benefits. Replacing a worn or damaged sensor with an original BMW component allows you to:

• stabilize engine operation at idle and under load,
• reduce the risk of the engine entering limp mode,
• maintain the correct air-fuel mixture across a wide rev range,
• minimize excessive fuel consumption resulting from incorrect dose adjustments,
• prevent premature wear of exhaust system components, such as the catalytic converter.

For BMW petrol engines, signal repeatability and the sensor's specific temperature characteristics are particularly important, ensuring proper cooperation with the factory control unit software.

Technical characteristics and compatibility

The offered NOx sensor / lambda probe is an OEM BMW component, designed to work with petrol-powered engines. The design, integrated with measurement electronics, enables rapid achievement of operating temperature and stable exhaust parameter readings under typical road conditions.

For proper part selection, it is crucial to verify compatibility using the OEM number or interchangeable numbers and to match it to the specific engine version and vehicle model year. In case of doubt, it is worth using the VIN to avoid compatibility issues and the need for re-disassembly.

Condition, installation, and operation

The item is offered as used, which allows for lower repair costs while maintaining the manufacturer's original specifications. Before installation, it is recommended to check the electrical installation, wiring harness, and socket for corrosion and mechanical damage to ensure a stable connection and proper communication with the control unit.

During replacement, it is worth paying attention to:

• proper routing of the sensor cable away from high-temperature components,
• applying the correct tightening torque in accordance with service documentation,
• the potential need to clear errors and perform adaptations in the engine control unit after installation.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the exhaust system area in your BMW and need other components from the same group, such as additional probes, oxygen sensors, or NOx sensors, check the available parts in the BMW Lambda probes and O2 sensors category.

When selecting used sensors and electronic modules, a guide describing the principles of checking compatibility by OEM numbers, hardware and software versions, and proper installation will be helpful – you can find it in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

If you want to learn more about purchasing second-hand parts and optimizing service costs, it is also worth reading the guide material Used parts – your guide to the best deals in the automotive store, which discusses practical criteria for selecting and operating used components.