Hello & hope this post helps future owners with this issue. i will try to explain it as best as possible, i'm not a mechanic so excuse any silly descriptions and the long post. I have a 2010 458 Italia 29K miles, i bought the car a few months ago , the car was babied its entire life and wasn't driven hard, always serviced on time and passed an independent inspection with no issues when i bought it. I had the car a few weeks then while driving one day and accelerating hard right around 7K RPM the car would flash "Engine system control failure" and go into limp mode, i'd restart and it would be fine but check engine light stayed on. The code that showed up on OBD was 1525, and stored codes were 1521 1523 this was the exact same situation another member here went through. I changed the battery, however this would repeatedly happen whenever i would rev the car hard, at least 1 out of 3 times. so the battery was not the issue. I read a few threads and found that 1 person who had the issue paid $10,000 for a new Planum *ouch. another had to go to ferrari have them disassemble the system then he never gave a darn to update the thread but i suppose it was big $$. My solution was taking it to the amazing Craig Calder at Fast Cars LTD in Redondo Beach because i knew if there was a way around spending big money throwing parts at it, Craig would figure it out. The shop there has some amazing talent, true Craftsmen is what i like to call them, people proud of their jobs, Mario & Francisco the techs are geniuses. They worked on the car for about a week, and were able to determine by cycling the flaps via computer that one of them was stuck (furthest one back of engine bay) and the other 2 also had an issue, (those front 2 are connected by a rod) They marked the flaps with marker to see how they swiveled- They were able to better reach the flaps i believe through the air box without removing the manifold and found that there is a little bearing that makes the arm which controls 2 connected flaps move, that bearing was seized (that part isnt for sale alone, you have to buy entire arm) but by lubricating the bearing and using some other methods they were able to free it and it worked - Now onto the other flap, that one was just barley opening because of some carbon buildup and grime around it (Most likely because the car wasn't driven hard even though it has close to 30k miles was driven around town) So they also lubricated around that flap, cleaned it, and it now freely moves. I picked up the car and took it up several times to high RPM and it is now working just fine with no issues. So we solved the issue without having to get a new Plenum or even remove the Manifold, of course it still took a lot of work and diagnosing but it was much cheaper than the other 2 options..I think that anyone having an issue with those flaps may find the little bearing that moves the arms which rotate the flaps the issue plus carbon buildup .