Hi, I'm facing the exact same issue - P0299 (Turbo/Supercharger “A” Underboost)
Turbo makes whining noise under 2,500rpm and after that it kicks in properly and boosts fine.
After driving for some more time, lights are lit with xmas lights on dashboard, TMPS, SMBC malfunction etc.
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- Mon Aug 11, 2025 3:10 pm
- Forum: Diagnostics and Maintenance using FORScan
- Topic: Mazda 6 2.2 175d - Loss of power until engine started again
- Replies: 4
- Views: 1888