Lexus LS power loss and stalling

I had similar symptoms with my LS, check engine light and stalling. Was it worse when the engine was cold? Any codes when you scanned it? Could be a bad oxygen sensor, spark plugs, or even a catalytic converter. What air-fuel ratio are you seeing?

The stalling does seem worse when the engine is cold. I haven't checked the air-fuel ratio. What codes should I be looking for? Did you resolve the issue on your LS, and how?

Cold stalling points away from the O2 sensor. Check for codes related to fuel injectors or misfires; those were the ones I was getting. Turns out, one of my injectors was bad. If you're getting similar codes, take it to a trusted workshop for diagnosis and potential injector replacement. Best not to mess with the fuel system yourself if you're not experienced. I let the pros handle it.

I appreciate the insights. A workshop visit is necessary. I will ask them to investigate the injectors. Thanks for sharing your experience; it has been most helpful. They quoted me 515€ for the repair, hopefully that fixes it.