Lexus RC Crankcase Ventilation Issue

The symptoms you describe point to a potential crankcase ventilation issue. I had similar problems with my 2012 Audi A4, though it had a standard gasoline engine. The symptoms were identical: check engine light, noticeable power loss, and smoke. The workshop diagnosed a defective crankcase ventilation valve causing improper emissions control. Was the smoke you observed blueish or blackish?

Thank you for your insight. The smoke appears to be more blackish in color. Could you elaborate on the specifics of the valve's malfunction in your Audi? Did it lead to any further complications if left unattended?

In my Audi's case, the valve was stuck partially open, leading to an unmetered air leak into the intake manifold. This resulted in an incorrect air-fuel mixture, causing the blackish smoke due to incomplete combustion. Prolonged operation like that can potentially damage the catalytic converter. Given your Lexus's symptoms and the blackish smoke, I strongly recommend taking it to a qualified workshop for a thorough diagnosis and repair.

I appreciate your assistance and the details you provided regarding your experience. Based on your recommendation, I scheduled an appointment with a certified Lexus workshop. The diagnosis confirmed a defective crankcase ventilation valve, and the repair cost was 360€. Thank you again for your help.