2019 AUDI S4 EA839 DE S4 (8W)
8W / Sedan and Avant / Global (notably EU, USA, Australia, and select others)
EA839 DE S4Exact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Carbon buildup on intake valves (direct injection engines)
- Mild-hybrid system battery degradation over long term
First checks
- Inspect turbocharger boost leaks
- Check service history for scheduled oil and brake fluid changes
- Verify functioning of mild-hybrid system components
Before replacing parts
- Save fault codes and freeze-frame data before clearing anything.
- Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
- Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.
Important notes
- Market-specific variations include slight power tuning for US vs Europe due to emissions regulations
- The mild-hybrid system improves fuel efficiency and reduces turbo lag slightly
- Avant (wagon) and sedan body styles share most specifications