40 / 45 TFSI (2.0 EA888 / 3.0 EA839)
2018–2024 · petrol · 1984cc · 245hp
Engine codes: DKNA, DLZA, DEWA
Reliability, common problems and owner reviews for the Audi A6 C8 40 / 45 TFSI (2.0 EA888 / 3.0 EA839). Check this before you buy used.
The petrols span the 2.0 TFSI (40/45 TFSI, EA888 Gen3 with 48V mild-hybrid — shared with the A4/A5/Q5) and the smooth 3.0 V6 TFSI (55 TFSI, EA839). The 2.0 EA888 Gen3 is robust (chain-driven, the Gen2 oil-burn long resolved) with the usual modern cautions — chain-tensioner, PCV, DI carbon — plus the 48V mild-hybrid system; the V6 adds its own complexity and cost. Both pair with the S tronic/tiptronic and quattro. A documented car with a healthy chain is dependable and refined. Buy on oil, chain and (48V/gearbox) service history.
Same engine, other cars
This is the same physical engine (DKNA) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
EA888 chain tensioner attention; PCV faults; DI intake carbon over time.
Fix / Workaround: Revised tensioner; PCV; decarbon.
Repair cost: €200–€1500
Typically appears after: 130,000 km
48V belt-starter system; dual-clutch fluid service.
Fix / Workaround: Diagnose 48V; S tronic fluid service.
Repair cost: €200–€1800
Typically appears after: 140,000 km
Mileage Thresholds
After 180,000 km: Chain + DCT window.
Pre-Purchase Checklist
- ☐2.0 EA888 Gen3 is robust
- ☐Same EA888 as A4 / A5 / Q5
- ☐Oil + chain + DCT history
Frequently asked questions
Is the Audi A6 C8 40 / 45 TFSI (2.0 EA888 / 3.0 EA839) reliable?
Maint. Sensitive — The petrols span the 2.0 TFSI (40/45 TFSI, EA888 Gen3 with 48V mild-hybrid — shared with the A4/A5/Q5) and the smooth 3.0 V6 TFSI (55 TFSI, EA839). The 2.0 EA888 Gen3 is robust (chain-driven, the Gen2 oil-burn long resolved) with the usual modern cautions — chain-tensioner, PCV, DI carbon — plus the 48V mild-hybrid system; the V6 adds its own complexity and cost. Both pair with the S tronic/tiptronic and quattro. A documented car with a healthy chain is dependable and refined. Buy on oil, chain and (48V/gearbox) service history.
What are the common problems and reviews for the Audi A6 C8 40 / 45 TFSI (2.0 EA888 / 3.0 EA839)?
The most commonly reported problems: Chain tensioner / PCV / carbon, 48V mild-hybrid / S tronic.
Is a used Audi A6 C8 40 / 45 TFSI (2.0 EA888 / 3.0 EA839) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.