Audi S5 8T 4.2 FSI CAUA Petrol Exhaust Oxygen Lambda Probe Sensor 07L906265

Audi S5 8T 4.2 FSI CAUA Petrol Exhaust Oxygen Lambda Probe Sensor is a component from the Lambda probes and O2 sensors category, designed for precise control of the air-fuel mixture in a petrol engine. A properly selected lambda probe stabilizes engine operation, supports correct combustion, and helps maintain compliance with exhaust emission standards. This component is a solution for users who expect a proven, original part tailored to the specifics of the 4.2 FSI unit.

Specifications and technical data

• SKU: 07L906265
• Mark: Audi
• Condition: Used
• OEM Part Number: 07L906265
• Substitutable numbers: 07L906265, 07L 906 265
• Fuel type: Petrol
• Category: Oxygen Sensors

The role of the lambda probe in an Audi petrol engine

The lambda probe in the 4.2 FSI CAUA engine is responsible for continuously measuring the oxygen content in the exhaust gases and transmitting this data to the engine control unit. Based on this, the injection system corrects the fuel dose, keeping the mixture in the optimal range for the petrol unit. A properly functioning O2 sensor reduces excessive fuel consumption, stabilizes idle operation, and helps protect the catalytic converter from overheating and damage resulting from an incorrect exhaust composition.

Benefits of using a dedicated lambda probe

Using a lambda probe matched to the Audi S5 8T 4.2 FSI ensures:

• consistent operation with the factory engine control unit and injection maps,
• stable engine operation across the full load range,
• more predictable throttle response,
• maintenance of proper exhaust emission parameters.

For a petrol engine, the probe's rapid response to changes in the mixture composition is particularly important – this ensures that injection corrections are smooth, and the driver experiences even power delivery. A functional O2 sensor also helps reduce the risk of warning lights related to the combustion system and catalytic converter.

Characteristics and application in the Audi S5 8T 4.2 FSI

The presented lambda probe is designed to work in the exhaust system of a petrol engine, where maintaining a precise air-fuel ratio is essential. In the 4.2 FSI CAUA unit, this is of particular importance due to high power and thermal loads, which is why the selection of the appropriate O2 sensor affects the durability of exhaust components and engine refinement. Dedicated fitment for the specific powertrain configuration facilitates installation and minimizes the risk of electrical compatibility issues.

Condition, verification, and selection of used electronics

The offered lambda probe is a used component, which allows for an economical repair of the exhaust system while maintaining operating parameters close to factory specifications. Before installation, computer diagnostics and an inspection of the electrical system are recommended to rule out other causes of errors in the fuel supply and exhaust emission systems. If you want to better understand when choosing a used O2 sensor makes sense and how to safely approach the purchase of automotive electronics, check out our guide The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Expanding the exhaust measurement system in an Audi

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional probes, O2 sensors before and after the catalytic converter, or components monitoring exhaust composition, check out the available parts in the Audi Lambda probes and O2 sensors category.