BMW 1 3 Series E87 E90 E91 Lambda Monitor Sensor Petrol N46 120i 320i 7547313

The BMW E87 E90 E91 Lambda Sensor Petrol N46 is an original exhaust system component from the lambda sensors and O2 sensors category, designed for BMW petrol engines from the N46 family. A used, tested lambda sensor allows for an economical yet professional repair of the fuel-air mixture control system, while maintaining the original performance characteristics of the engine unit.

Specifications and technical data

• SKU: 7547313
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 11787547313
• Substitutable numbers: 11787547313, 7547313
• Fuel type: Petrol
• Category: Oxygen Sensors

Application and Function in the N46 Petrol Engine

The lambda sensor in a petrol engine plays a crucial role in mixture composition control, transmitting information about oxygen content in the exhaust gases to the engine control unit. In N46 units fitted in BMW 1 Series E87 and 3 Series E90/E91, a properly functioning O2 sensor influences:

• stable idle and under load operation,
• correct fuel dose adjustment across the entire RPM range,
• maintaining fuel consumption at factory levels,
• reducing exhaust emissions and protecting the catalytic converter.

By using an original lambda sensor dedicated to the N46 engine, compatibility with the factory control unit software and correct signal interpretation by the ECU are ensured.

Benefits of Choosing an Original Used BMW Lambda Sensor

Choosing an original used BMW O2 sensor is a sensible solution for users who want to balance cost control with maintaining near-factory operating parameters. A used lambda sensor:

• comes from disassembly, which promotes structural compatibility with the specific engine type,
• ensures proper fitment of the thread and electrical connector to the wiring harness in BMW E87/E90/E91,
• helps avoid signal quality issues often encountered with cheap, low-quality aftermarket alternatives.

For many users, it is important that the original BMW lambda sensor works with factory fuel maps without the need for additional adaptations or software modifications.

Selection by Numbers and Technical Compatibility

When selecting a lambda sensor for a BMW E87, E90, or E91 with an N46 engine, matching by OEM part number and interchangeable numbers is crucial. This unit has assigned identification numbers that allow verification of compatibility with the specific engine version and vehicle year. This enables precise checking of whether the sensor will work with the existing engine control unit and wiring harness.

If you want to deepen your knowledge on selecting used sensors and electronic modules, you will find practical tips in the Global Parts guide: used automotive electronics – second-hand ECU modules and sensors. The article discusses, among other things, the importance of OEM numbers, hardware and software compatibility, and good installation practices.

Installation and Operation in the Exhaust System

The lambda sensor in a BMW with an N46 engine is installed in the exhaust system at the location designated by the manufacturer. Proper installation requires:

• using the correct lambda sensor wrench,
• observing the correct tightening torque,
• checking the condition of the thread in the manifold or exhaust pipe,
• correct routing of the cable and connection to original mounting points.

After installation, it is recommended to perform sensor adaptation in the engine control unit (if the service procedure allows for it) and verify system operation using OBD diagnostics – this allows for quick confirmation of correct signal and fuel corrections.

Other BMW Lambda Sensors and O2 Sensors

If you are looking for other BMW lambda sensors and O2 sensors for different models or engine versions, check out our dedicated category: BMW lambda sensors and O2 sensors. There you will find a wide selection of original parts from disassembly, which allow for professional repair of the exhaust and engine control system in various models of this brand.