Lexus LC Check Engine Light and Smoke

Interesting. I had comparable issues with my old Volvo V70. Engine light, rough idle, and some smoke. Turned out to be a crankcase leak. Is your idle also affected? Might be worth checking your emissions too.

Indeed, the idle does seem somewhat erratic. Emissions, you say? Could you elaborate on what parameters were out of spec in your case?

In my Volvo, the HC (hydrocarbon) levels were elevated, indicating incomplete combustion. Given your symptoms and mileage, and my past experience, a defective crankcase ventilation seems highly probable. I'd recommend having a workshop confirm it, as ignoring a crankcase leak can cause further problems.

I appreciate your insight. Based on your experience and the diagnostics, I authorized the crankcase ventilation valve replacement. The total damage amounts to 360€. Thank you for steering me in the right direction.