RAV4 Hybrid Fault Code Reduced Engine Power

That sounds incredibly frustrating! I had a similar issue with my Opel Insignia, also after some third-party modifications. Same symptoms: check engine light, error stored, and the car felt like it was running on fumes. Did you recently get any work done on the engine management system? An auto scanner will not be able to tell you if you have a faulty chip. But if you know you modified the engine, this could be the culprit!

Thanks for the reply! Yes, I did get a chip tuning a while ago. It was supposed to improve performance, but now I'm regretting it. What exactly was the problem with your Opel, and how did you fix it?

Alright, if you have a fault code and reduced engine power after chip tuning, it's highly likely that the tuning is the root cause. My Opel had a poorly written software flash that messed with the engine parameters. In the end, I had to take it to a specialist who knew how to properly remap the ECU. I strongly recommend you find a reputable workshop with experience in dealing with modified ECUs. They'll be able to diagnose the issue properly and either fix the tuning or revert it back to the original settings. Don't keep driving it like that, you might damage something!

Thank you so much for your help! It sounds like I need to bite the bullet and take it to a workshop. They confirmed that the tuning was indeed the issue and the repair cost 180€. Hopefully, they can sort it out without too much trouble. I really appreciate the advice!