2025 MINI Cooper S Problems: 1 Issues Every Owner Should Know
2025 model year · 3,500+ owner reports · Updated April 2026
According to Au7o's analysis of 3,500+ owner reports, the 2025 MINI Cooper S has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Direct Injection Carbon Buildup on Intake Valves with 3,500 owner reports. Across all issues, repair costs range from $400 to $800. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2007-2025 MINI Cooper S, all turbocharged direct-injection MINI engines (N14, N18, B46/B48) accumulate carbon deposits on intake valves since fuel is injected directly into the cylinder rather than washing over the valves. This reduces airflow and causes rough running.
Common Symptoms
- Rough idle
- Hesitation on acceleration
- Reduced fuel economy
- Misfire codes
- Loss of power
How to Fix
Walnut blast the intake valves to remove carbon deposits. This should be done every 40-60k miles as preventive maintenance. Install an oil catch can to reduce oil vapor reaching the intake.
What Owners Are Using
Parts and tips from 3,500+ owners who fixed this issue
- Tip
- 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)