Audi S6 C7 S7 4G Lambda Probe Oxygen Sensor 4 Pin Cyl. 5-8 4.0 Petrol 4H0906265C

Audi S6 C7 S7 4G 4.0 Petrol Lambda Sensor 4 Pins Cyl. 5-8 is a precise exhaust system component from the Lambda Sensors and O2 Sensors group, specifically designed for V8 petrol engines. It is responsible for accurate exhaust gas composition measurement on cylinder bank 5-8, allowing the engine control unit to make stable fuel dose corrections and maintain proper engine operation. This used OEM Audi part ensures factory fitment and correct compatibility with the vehicle's electronics.

Specifications and technical data

• SKU: 4H0906265C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0906256C
• Substitutable numbers: 4H0906256C, 4H0 906 256 C
• Fuel type: Petrol
• Category: Oxygen Sensors

Intended Use and Function in a 4.0 Petrol Engine

The presented lambda sensor is intended for the 4.0 V8 petrol engine in Audi S6 C7 and S7 4G models, covering cylinders 5-8. Thanks to its four-pin configuration, the sensor provides the engine control unit with precise information about oxygen content in the exhaust gases, enabling:

• maintenance of an optimal fuel-air mixture in closed-loop mode,
• stable idle and under load operation,
• proper functioning of the exhaust gas purification system,
• reduction of fuel consumption while maintaining the performance of the 4.0 TFSI unit.

Benefits of Using an Original Audi Lambda Sensor

Using an original sensor from the Lambda Sensors and O2 Sensors group in the sporty S6 and S7 models translates into a range of practical operational benefits. The component is structurally matched to the specific cylinder bank, which:

• ensures the correct signal characteristics for the Audi engine control unit,
• reduces the risk of diagnostic errors related to incorrect exhaust gas composition readings,
• supports the even operation of both V8 banks, which is important for smoothness and dynamics,
• facilitates diagnostics during subsequent service inspections.

A used OEM part is a sensible choice for repairs of advanced petrol engines, allowing you to maintain the system's factory operating parameters without the need for cheaper aftermarket alternatives with uncertain characteristics.

Installation Aspects and Compatibility

The lambda sensor dedicated to cylinders 5-8 in the Audi S6 C7 and S7 4G is structurally prepared to work with the electrical system of these models, which simplifies installation and reduces the need for modifications. The four-pin connector is matched to the vehicle's wiring harness, and the cable length and sensor body geometry are adapted to the specific location in the V8 engine's exhaust system.

When selecting a component, it is worth paying attention to compliance with OEM markings and interchangeable numbers – this allows you to confirm compatibility with a specific equipment version and control unit software. In case of doubt, selection by VIN or catalog data significantly facilitates correct sensor matching.

Professional Selection of Used Electronics and Sensors

For such critical components as a lambda sensor, correct matching to the engine version, fuel type, and control unit is crucial. It is advisable to use selection procedures based on OEM and reference numbers to avoid hardware and software compatibility issues. A detailed discussion of the principles for selecting used sensors and modules, along with practical examples, can be found in the guide Used Automotive Electronics – Second-Hand ECU Modules and Sensors, which helps in consciously planning repairs and upgrades of electronic systems.

Expansion of Audi Exhaust System Service

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