BMW E87 E90 E91 120i 320i N46 Sensor Lambda Probe Grey Petrol 7512985

BMW E87 E90 E91 120i 320i N46 Sensor Lambda Probe is an original exhaust system component from BMW, designed for N46 petrol engines. This precise exhaust oxygen sensor supports the proper operation of the engine control unit, maintains a stable fuel-air mixture, and ensures efficient catalytic converter performance, which translates into smoother engine operation and reduced exhaust emissions.

Specifications and technical data

• SKU: 7512985
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7512985
• Substitutable numbers: 11787512985, 7512985, 11717563243, 7563243
• Fuel type: Petrol
• Color: Grey
• Category: Oxygen Sensors

Purpose and technical function

The sensor from the Lambda probes and O2 sensors category is responsible for measuring the oxygen content in the exhaust gases of a petrol engine. Based on its signal, the control unit adjusts the fuel dosage, which allows the mixture to be maintained within the optimal range for the N46 engine in BMW 1 and 3 series models.

Using a functional oxygen sensor is particularly important when operating on petrol fuel, where precise mixture dosing affects engine refinement, fuel consumption, and the service life of exhaust system components.

Benefits of using the BMW lambda probe

Using the correct lambda probe in the N46 engine provides a range of practical operational benefits:

• more stable operation at idle and under load,
• more efficient correction of the fuel-air mixture composition,
• reduced risk of excessive catalytic converter wear,
• potential for reduced fuel consumption while maintaining correct combustion parameters,
• reduced probability of combustion-related error codes appearing in the engine control unit.

The component with a grey wire and sensor body finish is typical for this type of component and facilitates visual identification within the wiring harness.

Condition, fitment, and installation

The offered BMW lambda probe comes from the used parts group, which allows for an economical repair of the exhaust system while maintaining the manufacturer's original specifications. Before installation, it is recommended to perform a standard verification of the electrical wiring and the thread in the manifold or exhaust pipe to ensure proper sensor seating.

For proper selection, it is worth paying attention to the manufacturer's markings and compatibility with the N46 engine in BMW 1 and 3 series models. Proper fitment allows you to maintain factory engine performance parameters and avoid compatibility issues.

Expanding the measurement system in your BMW

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other elements from the same group, such as additional oxygen sensors, pre-catalytic sensors, or post-catalytic sensors, check the available parts in the BMW Lambda probes and O2 sensors category.

When selecting used electronic and measurement components, such as lambda probes or other sensors, it is worth following proven diagnostic procedures and practical tips. Helpful information can be found in the article: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?

Summary

BMW E87 E90 E91 120i 320i N46 Sensor Lambda Probe is an original oxygen sensor designed for BMW petrol engines, which supports proper mixture regulation and correct exhaust system operation. Choosing an original component from the Lambda probes and O2 sensors category allows you to maintain engine performance parameters in line with the manufacturer's specifications, while also providing a reasonable cost-effective solution for professional vehicle repair or service.