Lambda Probe Audi A4 B8 A5 8T Petrol Oxygen Monitor Sensor 1K0998262T

Lambda Probe Audi A4 B8 A5 8T Petrol Oxygen Monitor Sensor is a precision oxygen sensor responsible for monitoring exhaust gas composition and fuel system operation. This component from the Lambda probes and O2 sensors group supports proper fuel metering, stable engine performance, and exhaust emission control in petrol-powered Audi vehicles.

Specifications and technical data

• SKU: 1K0998262T
• Mark: Audi
• Condition: Used
• OEM Part Number: 1K0998262T
• Substitutable numbers: 1K0998262T, 1K0 998 262 T
• Fuel type: Petrol
• Category: Oxygen Sensors

Function and role of the lambda probe in a petrol engine

The lambda probe in an Audi petrol engine plays a key role in the closed-loop control of the air-fuel mixture. Based on the sensor signal, the engine control unit adjusts the fuel dose to keep the mixture within the optimal operating range of the catalytic converter. This translates into:

• stable idle speed and smooth acceleration,
• more predictable throttle response,
• maintaining the correct operating temperature of the exhaust system,
• reducing the emission of harmful compounds in exhaust gases.

For Audi A4 B8 and A5 8T petrol engines, a properly functioning lambda probe is essential both for the durability of the catalytic converter and for compliance with emission standards.

Benefits of using an original Audi lambda probe

The original oxygen sensor designed for Audi ensures correct electrical parameters and operating characteristics matched to the injection maps used in these models. In practice, this means:

• reliable voltage signal across the full range of engine loads,
• consistency with the factory engine control unit software,
• reduced risk of diagnostic errors and MIL light activation,
• better repeatability of readings compared to aftermarket replacements with inconsistent characteristics.

As a result, the petrol supply system can operate under stable conditions, which helps maintain fuel consumption at a predictable level and reduces the need for additional diagnostics.

Used condition and installation aspects

The offered lambda probe is a used component, which allows for an economical repair of the exhaust system while maintaining the manufacturer's original specifications. This type of sensor is designed for installation in a threaded socket on the manifold or exhaust pipe section provided by the vehicle manufacturer.

When replacing, it is recommended to:

• use a suitable lambda probe wrench to avoid damaging the body and cable,
• check the condition of the electrical harness and connector,
• perform adaptation or clear errors in the engine control unit after installation, if required by the service procedure.

Selection and compatibility within the VAG group

This lambda probe model was developed for use in Audi A4 B8 and A5 8T petrol engines, where it functions as a sensor monitoring oxygen content in exhaust gases. Thanks to its assignment to a specific manufacturer reference, it is possible to precisely match it to the electrical installation and engine control unit used in these models.

In case of doubts regarding selection, it is worth verifying compatibility with the specific engine version and vehicle year using the manufacturer's catalog or service documentation to ensure proper cooperation with the petrol control system.

More items from this group and knowledge about used electronics

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

When deciding to use electronic components in a car, including sensors and modules, a guide describing the principles of safe selection of such components may be helpful – you can find detailed tips in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.