2018 Audi A4 Pre-Purchase Inspection Checklist
Known Issues — 2018 Audi A4
MODERATE
Quattro rear differential oil seal leaks on AWD models
MODERATE
Electric power steering occasional loss of assist warning
MODERATE
Carbon buildup on intake valves requiring periodic cleaning
MINOR
Virtual Cockpit display delamination or pixel issues
MINOR
Sunroof wind noise at highway speeds due to seal degradation
MINOR
Active noise cancellation system failures causing audio buzzing
What to Inspect
- Check for quattro rear differential oil leaks
- Verify Virtual Cockpit display quality — no delamination or pixel loss
- Test electric power steering through full lock both directions
- Scan all modules for fault codes
- Check sunroof seals and test for wind noise at speed
- Verify all driver assistance systems function (lane keep, adaptive cruise)
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Oil change (synthetic) | every 10,000 miles | $130-$170 |
| DSG S tronic service | every 40,000 miles | $300-$450 |
| Spark plugs | every 40,000 miles | $150-$200 |
| Quattro rear differential fluid | every 40,000 miles | $150-$220 |
| Brake fluid flush | every 2 years | $100-$150 |
| Pollen/cabin filter + air filter | every 20,000 miles | $80-$120 |
| Brake pads and rotors (front) | every 40,000-60,000 miles | $400-$700 |
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