2021 Audi A6 Pre-Purchase Inspection Checklist
Known Issues — 2021 Audi A6
MODERATE
48V mild hybrid BSG failures on MHEV models
MODERATE
MMI dual touchscreen ghost inputs and unresponsive areas
MODERATE
Air suspension corner sag from failed air springs
MODERATE
Carbon buildup on intake valves (direct injection)
MODERATE
ADAS radar/camera fault codes after minor front-end impacts
MINOR
Wireless Apple CarPlay disconnects on some software versions
What to Inspect
- Test both MMI touchscreens for accurate and responsive inputs
- Test air suspension across all modes and road conditions
- Check 48V MHEV system for fault codes if equipped
- Verify ADAS — adaptive cruise, lane centering, emergency braking
- Scan all modules for stored fault codes
- Test wireless CarPlay/Android Auto for stable connectivity
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Oil change (synthetic) | every 10,000 miles | $150-$200 |
| Spark plugs (V6) | every 40,000 miles | $200-$300 |
| Quattro rear differential fluid | every 40,000 miles | $150-$220 |
| Air suspension service (if needed) | as needed | $800-$2,000 |
| Brake fluid flush | every 2 years | $120-$160 |
| Cabin filter + air filter | every 20,000 miles | $100-$150 |
| Brake pads and rotors (front) | every 40,000-60,000 miles | $500-$900 |
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