Audi Audi A8 2002-2010 Exhaust Specifications

The exhaust pipes on the 2002-2010 Audi A8 have an outer diameter of 70 mm (2.75 inches) for the 4.2L V8 models and 65 mm (2.56 inches) for the 3.0L V6 models. These measurements are critical for ensuring proper fitment of aftermarket or replacement exhaust systems.

The 2002-2010 Audi A8 is equipped with a dual catalytic converter system, featuring a primary and secondary catalytic converter per bank. The primary converters are located close to the exhaust manifolds and are designed to reduce emissions during cold starts, while the secondary converters further reduce pollutants before the exhaust exits the system.

Audi does not specify a fixed replacement interval for the exhaust system. However, components such as the catalytic converters, oxygen sensors, and mufflers should be inspected every 60,000 miles (96,000 km) or during routine maintenance. Signs of rust, leaks, or reduced performance may indicate the need for replacement.

Installing an aftermarket exhaust system may void your warranty if it is determined that the modification caused damage to other components. Always consult your Audi dealership or warranty documentation before making modifications. Using Audi Genuine Parts or approved aftermarket systems is recommended to avoid warranty issues.

The exhaust manifold bolts on the 2002-2010 Audi A8 should be torqued to 25 Nm (18.4 ft-lbs) for the 4.2L V8 engine and 20 Nm (14.8 ft-lbs) for the 3.0L V6 engine. Proper torque is essential to prevent leaks and ensure a secure fit.

A failing oxygen sensor may trigger the Check Engine Light (CEL) and cause symptoms such as poor fuel economy, rough idling, or increased emissions. Use an OBD-II scanner to retrieve fault codes (e.g., P0130-P0167) and inspect the sensor for contamination or damage. Replacement sensors should meet OEM specifications.