Prius engine running lean

My 2019 Toyota Prius hybrid with only 35889 km seems to be running lean. I've noticed a reduction in engine power, and the check engine light keeps popping on. It also runs really rough now, and it even jerks a bit when I try to accelerate. Has anyone experienced anything like this?

4 comment(s)

I had something similar happen with my Prius. Is it throwing any codes related to the air-fuel ratio, or maybe the oxygen sensor? It could also be related to the mass air flow sensor. Have you checked the intake manifold for any leaks?

Thanks for the quick response! I haven't checked any of those specifically. I don't have the tools to check the air-fuel ratio or the oxygen sensor myself. Is there any way to check the intake manifold for leaks without special equipment? How did you resolve your similar issue?

Unfortunately, I wasn't able to diagnose it myself. I took it to a trusted workshop, and they found the injection valve/injector was defective, causing the lean running. It’s probably best to get yours checked by a professional too.

Okay, I appreciate the advice! I'll take it to the shop ASAP. They confirmed it was indeed the fuel injectors, and the repair cost me 515€. Thanks again for pointing me in the right direction!

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