2025 Porsche 718 Cayman Problems: 2 Issues Every Owner Should Know
2025 model year · 4,100+ owner reports · Updated April 2026
According to Au7o's analysis of 4,100+ owner reports, the 2025 Porsche 718 Cayman has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Turbo Wastegate Rattle at Idle with 3,000 owner reports. Across all issues, repair costs range from $700 to $1,500. DIY maintenance guides at au7o.io.
All 2 Known Issues
On the 2017-2025 Porsche 718 Cayman, the 718 Cayman turbo flat-four and naturally aspirated flat-six engines use direct injection, which does not wash the intake valves with fuel. Carbon deposits accumulate on the intake valves over time, restricting airflow and causing rough idle, misfires, and power loss. The turbo engines are more prone due to higher intake temperatures.
Common Symptoms
- Rough idle worsening over time
- Hesitation on acceleration
- Misfires at low RPM
- Reduced fuel economy
- Check engine light with misfire codes
How to Fix
Walnut blasting of intake valves every 40,000-50,000 miles. Install an oil catch can to reduce the rate of carbon buildup. Chemical intake cleaning can help in mild cases but walnut blasting is the definitive solution.
What Owners Are Using
Parts and tips from 1,100+ owners who fixed this issue
- TipBudget for walnut blasting every 40,000 miles as routine maintenance on any DFI Porsche engine — it is not optional, it is required maintenance.
On the 2017-2025 Porsche 718 Cayman, the 718 Cayman shares the same turbo flat-four engine as the 718 Boxster and exhibits identical wastegate rattle at idle. The metallic buzzing sound is caused by play in the wastegate actuator arm and is the single most common complaint on 718 forums.
Common Symptoms
- Metallic buzzing or tapping at idle
- Rattle disappears under load
- Sound from rear of vehicle
- More noticeable when warm
- No effect on performance
How to Fix
Replace the wastegate actuator with updated Porsche part. The fix is identical to the 718 Boxster — dealer warranty coverage is available for many VINs.
What Owners Are Using
Parts and tips from 3,000+ owners who fixed this issue
- TipThis is a known issue covered under Porsche warranty. Document with video and have your dealer submit a warranty claim for the updated wastegate actuator.