Lexus ES Intermittent Ignition

I had almost the same symptoms with my ES. Check the starter motor relay too. A relay is an electrical switch that uses a small current to control a larger current. Has the ignition key been thoroughly checked? It could have issues communicating with the car's computer, thus failing to start the engine. The key could also cause rough running, depending on the generation and model.

Thank you for the quick reply. Can you clarify what you mean by checking the "ignition key"? What specific aspects of the key should be examined?

Certainly. The key's internal transponder chip is what I meant. This chip sends a signal to your car's immobilizer system, allowing it to start. If the chip is damaged or not communicating properly, the engine may not start or cut out randomly. I suggest you visit a workshop. In my case it turned out that the mentioned fuse was defective, costing a mere 52€ to repair.

I appreciate the advice. As suggested, I took the vehicle to a reputable workshop, and it was indeed a defective fuse, as you suspected. The repair cost me 52€, as you had mentioned. Thank you again.