karlweiss1
Lexus RC Whistling Hissing Noise
Summary of the thread
A 2021 Lexus RC hybrid with 121,294 km is experiencing reduced engine power, poor response, and increased fuel consumption, accompanied by a whistling and loud hissing noise under acceleration. The issue is suspected to be a boost pressure actuator fault, possibly involving a defective electrical bypass valve in the turbo wastegate system. The suggested solution is to check the turbo actuator, which was confirmed by another owner with similar symptoms, leading to a successful repair.
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4 comment(s)
karlweiss1 (community.author)
Thanks! When you say 'check the turbo actuator,' what exactly did you do? Did you replace it yourself, or did you just confirm it was the problem before taking it to a workshop? I'm comfortable with a wrench, but turbos make me nervous.
annieagle1
Nah, I'm not that brave. Just pointed the mechanic in that direction. Turned out to be the culprit. New actuator and I was good to go.
karlweiss1 (community.author)
Alright, that's the confirmation I needed. Sounds like a workshop visit is unavoidable. Thanks for the insight! I'll let you know what happens. It turned out it was indeed the electrical bypass valve, and the total repair was around 250€. Really appreciate your advice!
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LEXUS
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RC
annieagle1
Sounds familiar. I've got an RC too, and I had similar symptoms. Whistling, then the hissing... power loss was gradual at first, then BAM. Check your turbo actuator.