bernd_schulz1

Lexus ES Lean Condition

I'm officially pulling my hair out. I've got a 2023 Lexus ES with a gasoline engine and it's driving me nuts. I'm experiencing a noticeable loss of power, the check engine light is mocking me, and the engine's running rough, especially when accelerating – it feels like the car's jerking around. I've already clocked 139915 km. I suspect that it might be running lean (too little fuel). I'm not a total newbie; I've checked for obvious vacuum leaks and cleaned the mass air flow sensor. Could a faulty catalytic converter or a clogged EGR valve cause this, or am I barking up the wrong tree? Any ideas?

A 2023 Lexus ES is experiencing a lean condition, leading to a noticeable loss of power, rough engine performance, and an illuminated check engine light. Initial checks for vacuum leaks and cleaning the mass air flow sensor did not resolve the issue. The problem was ultimately traced to a faulty fuel injector, which, once replaced, resolved the symptoms.

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4 comment(s)

Hmm, sounds familiar. I had similar symptoms on my ES. Reduced power, rough running, and the dreaded check engine light. I chased vacuum leaks and even cleaned the intake manifold, but that didn't fix it. Did you use a proper scanner to read the fault codes?

Good question. Yeah, I used a scanner, and it's throwing codes related to a lean condition. So, you experienced similar issues on your ES, you say? What exactly was causing your engine to run lean? Was it also showing a lean code? I'm just trying to narrow things down before I start throwing parts at it.

Yes, I had the same lean codes. Don't start replacing the catalytic converter just yet! In my case, it turned out to be a defective fuel injector/injection valve. I would definitely take it to a workshop. They can test your fuel injectors, and a proper diagnosis will save you a lot of time and money in the long run.

Thanks! I appreciate the advice! I took it to a certified workshop, and you were spot on, after properly testing they determined it was indeed a faulty fuel injector. I replaced it, and that solved all the issues. The final bill came out to 515€. Thanks again for the heads-up!

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