Audi A8 D4 — Reliability
Reliability Summary
Engine
4.0 TFSI V8 TT — 69/100
ACCEPTABLE
Known Issues
6
Engine in this model
Known Issues Across All Engines
| Issue | Engine | Severity |
|---|---|---|
| Turbocharger bearing wear - blocked oil-supply strainer, heat in the hot vee (recall) | 4.0 TFSI V8 TT | high |
| Fuel line and high-pressure pump supply line leaks - fire risk (recalls) | 4.0 TFSI V8 TT | high |
| Cooling system - plastic water-pump and thermostat housings crack | 4.0 TFSI V8 TT | moderate |
| Upper timing-chain tensioner wear | 4.0 TFSI V8 TT | moderate |
| Oil consumption - valve-stem seals (2013-2014), piston rings, PCV valve | 4.0 TFSI V8 TT | moderate |
| Cylinder bore cracks - 2021 production batch (recall) | 4.0 TFSI V8 TT | minor |