LFA Boost Pressure Issue

I'm experiencing a boost pressure issue with my 2010 Lexus LFA, gasoline engine. Mileage is at 155157 km. The check engine light is on, accompanied by reduced engine power and poor engine response. I also hear a distinct whistling noise, transitioning into a loud hissing during acceleration. The engine occasionally stalls at idle, and fuel consumption is noticeably higher. I suspect a defective electrical bypass valve, what do you think?

4 comment(s)

Sounds like a boost leak. Have you checked the pressure sensor or turbo actuator? Could be a vacuum line issue. Is the whistling constant or only under load?

I haven't had a chance to check the pressure sensor directly. The whistling is more pronounced under load. Could a faulty actuator cause these symptoms? What readings should I expect from the pressure sensor if it's failing?

A faulty actuator definitely fits the symptoms. Without proper tools, diagnosing the pressure sensor accurately is tricky. Given the hissing and stalling, I'd recommend a workshop visit. They can properly check for boost leaks and actuator function.

Thanks for the insights. It turned out to be a defective electrical bypass valve as suspected. Repair cost was 250€. Appreciate the help!

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