Hey, I recently had a similar problem with my 2014 Toyota Auris. I had a wastegate valve actuator failure in the exhaust system. The mechanic said that this is a pretty serious issue because it directly affects the boost pressure and therefore the engine performance. The valve actuator was changed after the diagnostic device detected the fault. As a result, my car ran smoothly again and the check engine light no longer came on. It was a lot of work, but afterwards my car was fully functional again. Basically, you shouldn't hesitate and act quickly in the event of such a fault. It's best to have it looked at by a professional - it's not something you could solve yourself. Hopefully this is helpful to you in some way. Good luck!

(Translated from German)

Hey, thanks for the quick reply! Do you happen to remember what you had to pay for the repair on your Auris? And have you had any similar problems or other difficulties since then? Greetings!

(Translated from German)

Hey, sure, I remember the repair costs exactly. I had to pay €1820 to replace the wastegate valve actuator. That's a lot of money, of course, but after that the problem with the functional restriction of the boost pressure control was really solved and since then my Auris has been running like clockwork again. No jerking, no more loss of power. Simply great! Your Hiace should run smoothly again after that. Maybe that will help you. Greetings back!

(Translated from German)

Oh man, that sounds like a lot of money... But if it fixes the problem and my car runs well again afterwards, I think it's worth it. Thanks for your help and your quick reply! I'll keep an eye on it and bring it to the mechanic's attention. Keep your fingers crossed that everything goes smoothly. Bye!

(Translated from German)