Toyota Avensis Verso D4D 2002 E-VRV Valve. P1251, P0234 Fault Codes.

I cleaned out the EGR, but I slso got the P1251 code. Which is something with the E-VRV valve. I took a look at it and seen that the filter is broken of, so I ended up replacing it. Took it for a test drive and still it lost power and the code showed up, then, decided to clean it with my ultrasonic cleaner and it seemed to help a little bit. But then the P0234 showed up, which means turbo over boost, which is not good. But I took it for a test drive later a few times and everything seems to be okay, so for right now I will let my grandpa drive it and see how it does, if anything happens I will come back to this.