CHR boost pressure actuator fault

I own a 2021 Toyota CHR with a gasoline engine and 119121 km. I'm experiencing a boost pressure actuator fault. The check engine light is on, engine power is reduced, and engine response is poor. I also hear a whistling noise and loud hissing during acceleration, the engine occasionally stalls at idle, and fuel consumption is increased. I suspect a defective electrical bypass valve. Any insights?

4 comment(s)

Those symptoms certainly point to a turbo system issue. The whistling and hissing, coupled with the reduced power, strongly suggest a boost leak, possibly around the actuator valve or associated hoses. Have you checked the pressure sensor readings, if you have the tools available? Faulty readings could also indicate a sensor issue masquerading as an actuator problem. Also, carefully inspect the vacuum lines connected to the turbo actuator for any cracks or disconnections. A visual inspection can sometimes reveal the culprit before you start replacing parts.

Regarding the pressure sensor readings, can you elaborate on what constitutes a faulty reading in this context?

Certainly. I mean readings that are significantly outside the expected range for your engine's operating conditions. Under heavy acceleration, you should see a consistent rise in boost pressure. A faulty sensor might show erratic spikes, flatlines, or simply display values that don't correlate with the engine load. Considering the symptoms, and the mileage, while it could be a sensor, the failing actuator is likely. If it's difficult to diagnose on your own, I'd recommend having it professionally inspected, so that the correct replacement can be done.

Understood. Professional inspection confirmed a defective turbo boost pressure actuator valve. Replacement cost 250€ resolving all issues.

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