Constantly low tire pressure on Toyota Prius Hybrid 2015: workshop necessary?

Hey, I can understand your frustration. I drive a 2012 Toyota Prius Hybrid and recently had the exact same argument with it. Sporadic faulty communication between ECUs can cause this type of problem. Last time at the garage, the mechanics did some diagnostic work and checked the main ECU, as well as the internal communication between the ECUs. It is indeed a serious problem and should be fixed immediately to avoid major damage. In my case, some settings in the ECU had to be reset and reconfigured, which eventually fixed the problem. So, better go to the garage and get it checked before it gets worse! Hope this helps you.

(Translated from German)

Thanks for the feedback! I was hoping to sort it out without a garage, but maybe I don't have a choice. Your Prius is a few years older than mine. Do you happen to remember how much it cost you to reset and reconfigure the ECUs? And did you have similar problems again afterwards or has everything been fine since then?

(Translated from German)

Hey, no problem, glad to help! Yeah, I totally understand, workshop visits are always a bit of a hassle. In my case, the reconfiguration and resetting of the control units cost a total of €955. Sure, it's not a lot of money, but since then my Prius has been running like clockwork again and I've had no more similar problems. And the best thing is that the tire pressure problem was solved after the workshop visit. Hope that helps you. Drive safely!

(Translated from German)

Thank you very much, that's really helpful! Well, €955 is a fair bit of money, but if it helps I guess I'll have to bite the bullet. I'm really relieved to hear that you haven't had any other problems. I'll probably have to make an appointment at the garage, even though I'm not exactly dying to. Thank you for your advice and I wish you a safe journey at all times!

(Translated from German)