Audi A6: Air Suspension Strut Perishing and Compressor Failure (C7)

The C7 A6 equipped with air suspension (standard on some Quattro variants and optional on others) uses air struts with rubber air bags that perish with age. Cracked air bags cause one or more corners to sag. The compressor runs continuously to compensate, overheating and burning out. Both front and rear struts fail; rear struts are the most common failure point on C7 examples in Australia. Given the age of C7 imports now entering the Australian used market, this fault is increasingly common and is frequently undisclosed by private sellers.

• Car sitting noticeably lower at one or more corners when parked
• Air suspension or chassis fault warning on the Audi MMI cluster
• Compressor audible running continuously from the boot area
• Hissing noise from a wheel arch, particularly at the rear

1. 1

   Inspect ride height at all four corners for consistency.

2. 2

   Listen near each wheel arch with the engine off for air leaks.

3. 3

   Scan the suspension control module for fault codes including compressor overtemperature.

4. 4

   Confirm whether the car raises and lowers correctly across all height settings.

5. 5

   Ask how long the fault has been present.

Parts involved: Air suspension strut, Shock absorber / strut.

≈A$1,100 to ≈A$5,060 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Does the car sit level at all four corners at all times, including after sitting overnight?”
• “Has any air strut or the compressor been replaced?”
• “Any suspension warning lights active or recorded in history?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.