Audi Audi A8 1994-2002 Exhaust Specifications

The exhaust pipes on the 1994-2002 Audi A8 have an outer diameter of 60mm for the standard trim and 65mm for the performance-oriented trims. The inner diameter varies slightly depending on the specific model year and engine configuration.

The 1994-2002 Audi A8 is equipped with a three-way catalytic converter with a ceramic monolith substrate. The converter is designed to reduce emissions of CO, NOx, and hydrocarbons, meeting Euro 3 emission standards for most models.

Audi recommends inspecting the exhaust system every 15,000 miles or 12 months, whichever comes first. This includes checking for leaks, corrosion, and ensuring all mounting brackets and hangers are secure. Replace worn components, such as gaskets or mufflers, as needed.

Yes, aftermarket exhaust systems are available, but they must comply with local emissions regulations. Ensure the system is compatible with your specific engine code (e.g., AHC, AQP, or ATQ). Using non-genuine parts may void your warranty and affect performance.

The exhaust manifold bolts on the 1994-2002 Audi A8 should be torqued to 25 Nm (18.4 lb-ft) for the initial tightening, followed by an additional 90-degree turn. Always use new bolts and gaskets during reassembly to prevent leaks.

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 replace the sensor if necessary.