Lexus SC boost pressure issue

I have a 2005 Lexus SC with a gasoline engine. The check engine light is on, and I've noticed reduced engine power and poor response. There's a whistling noise that turns into a loud hissing sound when accelerating. The engine has stalled at idle a few times, and my fuel consumption seems higher. I have 153807 km on the odometer. Could this be related to the boost pressure actuator or a defective electrical bypass valve?

4 comment(s)

Whistling and hissing? Sounds like a boost leak. Is it throwing any specific codes? Have you checked all the hoses connected to the turbo? Could also be a dodgy pressure sensor messing things up.

I haven't personally checked the hoses. Is there a specific diagnostic trouble code I should be looking for to confirm a boost pressure actuator fault?

A faulty actuator can definitely cause those symptoms. Could be a P0243, P0245, or P0246, but without scanning it, it's all guesswork. I'd seriously consider getting it checked out by a workshop. They can properly diagnose the actuator and related components.

A workshop visit was necessary. It turned out to be a defective electrical bypass valve, as suspected. The repair cost was approximately 250€, including parts and labor. Thanks for pointing me in the right direction!

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