Lexus UX power loss whistling noise

I have a 2020 Lexus UX with a gasoline engine. The check engine light is on, and the car feels like it's lost power. Acceleration is sluggish, and there's a weird whistling noise, turning into a loud hissing sound when I try to go faster. Sometimes it stalls when idling, and my fuel consumption has definitely gone up. I'm suspecting something related to boost pressure. Has anyone experienced something similar?

4 comment(s)

Sounds familiar. I had a similar issue with my old Saab 9-3 a few years back. Symptoms were almost identical – check engine light, power loss, weird noises under acceleration. I'm not a Lexus expert but did you check for boost leaks around the turbo? Maybe the boost pressure actuator is faulty?

Boost leaks, huh? I haven't checked specifically for those yet. Where exactly should I be looking, and is there any way to test the boost pressure actuator without specialized tools?

With the Saab, the leaks were usually around the intercooler piping or vacuum lines connected to the turbo. As for the actuator, not really. If it's electrical bypass valve defective, testing it at home might be tricky without proper equipment. Maybe best to bring it to a workshop and have them check it.

I appreciate the input. Seems like a trip to the workshop is inevitable. It was in fact the electrical bypass valve that was defective. The total repair cost was around 250€.

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