1999 — 2003
4.2L V8 (AQJ/ANK) - Quattro Sedan/Avant
Petrol
Test the transmission shift quality by gently accelerating in both 'D' and Tiptronic mode. | Description: It is worth keeping an ear out for any hesitation or clunking during gear changes, as the 5HP24 gearbox can show signs of wear in higher mileage examples.
Check the engine bay for any sweet-smelling coolant odours while the engine is running at operating temperature. | Description: Due to the engine's compact design and age, checking for small coolant leaks around the valley pan or plastic cooling pipes is a wise move.
Observe the instrument cluster display while the engine is running. | Description: Faded or missing pixels in the central Driver Information System (DIS) screen are quite common for C5 chassis vehicles, and it is worth noting if it affects your visibility.
Test the steering and suspension by driving over varied road surfaces. | Description: Be mindful of any knocking or vibrations, as the aluminium multi-link front suspension setup can be sensitive to the condition of control arm bushings over time.
Usually marks the point where original suspension components and cooling system hoses have likely reached the end of their design life.
Often the time to verify that the timing belt service has been documented, as this is a critical maintenance interval for the 4.2L V8.
Generally an opportunity to check for minor oil weepage from valve cover gaskets and ensure the vacuum lines have been inspected for brittleness.
Verify the timing belt, water pump, and tensioner were replaced according to service intervals.
Check for a complete logbook of transmission fluid changes, as these are often overlooked.
Ensure the Quattro all-wheel-drive system is smooth and quiet during tight, low-speed turns.
Inspect the condition of the brake discs and pads, as these are significant components on a V8-powered sedan.
Confirm the air conditioning system functions effectively to ensure the climate control modules are operating correctly.
Estimated repair costs if issues arise
Since this is an interference engine, you might eventually need to budget for this service to ensure longevity and peace of mind if there is no recent proof of completion.
If the transmission begins to show signs of slipping or harsh shifting in the future, you may need to consider a rebuild or a refurbished unit to restore factory-smooth operation.
To maintain the refined ride quality the S6 is known for, it is common to consider replacing control arms and bushings once they begin to show wear.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer