My 07 R56 is through a P2177 code after some hard driving in sport mode and sometimes with out. I have seen this fault on a few threads but no one has yet to figure it out. Closes I have come to this is my forge Intake causing this problem because that is when this started however I was told from the dealer at the same time I had a hole in my intercooler. Well went with the Wagner Tuning intercooler. Installed the Wagner Intercooler drove for a week no faults IAT read 5-10 diff in temps from outside holding boost good PER scangauge2. This pass Saturday I drove about 30 miles. Ran good in sport mode over at 13psi and air fuel at 13.2 PER scangauge. Went inside the store turned my car off. Stayed in the store for 20 mins. Came back outside started my vehicle and CEL engine came on for P2177 lean mixture fault pending and rough idle. A code I did not have before the intercooler at least wasn't being shown from my scangauge. The weird thing for me is that my IAT temp shot to 103 degrees on a 50 degree day. After the car had been sitting. Cleared the fault vehicle now in limp mode drove home temps started to fall to about 69-70 degrees. Never would drop below that. Got home let it sit let DME go to sleep started back up hours later no problem. I will say when I did the install I used the stock charge pipes that do not fit all that well. I have a Forge intake tube intercooler and stock diverter valve oh and Walnut blast done 10k miles ago personally done. Now my question can a tune fix this because my stock intake is junk slipped of the turbo and would loose vacuum assist to the booster. Plus I don't want to send another 200-300 for a Alta or K&N or did I just leave something loose? My plan this weekend was to order Forge charge pipes unless you all recommend I do something else or buy something else. Any help you guys can offer would be great thanks.

 

A lean air fuel ratio can cause high cylinder temperatures, hot enough to burn and damage rings, pistons and valves. I believe you have a leak somewhere after you installed the new intake. Best thing to do is eliminate the Forge intake and replace with stock. This wouldn't be the first time someone installed a new intake and found hose or pipe was leaking.

 

Yea I guess I will have to look into buying another one. My stock intake slips off that donut and the PCV leaks. Was just hoping hoping a tune could fits this. Thanks