2015 Audi RS5 Problems: 1 Issues Every Owner Should Know
2015 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 2015 Audi RS5 has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues, repair costs range from $800 to $1,500. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2013-2015 Audi RS5 4.2L V8, the Audi RS5 B8 with the naturally aspirated 4.2L V8 develops significant carbon buildup on the intake valves due to direct injection. The high-revving nature of this engine makes carbon buildup particularly impactful on performance.
Common Symptoms
- Power loss from original spec
- Rough idle
- Misfires
- Hesitation at lower RPMs
- Reduced throttle response
How to Fix
Confirm carbon buildup by scanning for misfire/fuel-trim faults, reviewing live data, and inspecting the intake valves with a borescope after removing the intake manifold. The proper repair is an intake-valve carbon cleaning service—typically walnut-shell blasting or manual chemical cleaning—while replacing the intake manifold gaskets, injector seals/O-rings, and PCV-related breather components if leaking or contributing to oil vapor. After reassembly, clear adaptations, perform a throttle-body/basic setting relearn, and road test to verify restored high-RPM pull and smooth idle. Independent shops typically charge about $800-$1,500 for a carbon clean on the 4.2 FSI V8, while dealer pricing can run roughly $1,500-$2,500 depending on how many seals and ancillary parts are replaced.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeBluetooth OBD-II scanner for reading engine codes and monitoring live data (BlueDriver Bluetooth OBD2 Diagnostic Scan Tool)
- UpgradeQuality synthetic oil and filter combo for engine maintenance (Mobil 1 Full Synthetic Oil and Filter Bundle)