2024 Lexus RX — battery dies after the car sits for a weekend — buyer question from California

Checked the easy stuff on the 2024 Lexus RX and found one clue worth chasing before I book a shop. I already checked the easy fluid levels.

This is usually cheaper to test than to guess. Move a coil or plug on the 2024 Lexus RX if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. Run the total, not the monthly, before you commit. That's coming from doing this as an owner, not a shop. I'd rather look cautious in this thread than stuck later.

Start with the test that can prove you wrong. Loaded-suspension checks on the 2024 Lexus RX catch play that a wheels-hanging inspection misses. Save the big job until that test fails. Was this after sitting overnight? If it repeats twice more I'll book time.

Intermittent stuff lies if you only catch it once. Capture voltage while the 2024 Lexus RX is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. On “battery dies after the car sits for,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Wrote this up on my lunch break.

I wouldn't throw parts yet. Two 2024 Lexus RXs can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. This is from a 2024 Lexus RX in California. Run the total, not the monthly, before you commit. I'd rather pay for diagnosis than a second guess-repair.