Well we recently had to put on a new catalytic converter and turbo w/exhaust manifold (Dorman brand). First catalytic convert was not OEM and it kept throwing a P0420 code until we replaced it with a OEM catalytic convert. NO more P0420 but we now have a P2261. Its been back to the shop once for the P2261 and we had a couple loose nut/bolts from install and they did something else but forgot what it was. Well its going back into the shop tomorrow for the P2261. I do know for sure they did not replace the two oil lines on the turbo. Checking the air filter when I get home to see if its dirty or not. Just lost as what to do if it keeps coming back. Don't think the ECM has had an update or not (if that would even help or not). They also checked for vacuum leaks and found none.