Greetings.

I have a '05 745i with 126K on it. It runs well, but I cannot get rid of code P0492. It comes right back in two days after I reset he CEL. Replaced Y-hose going to the air pump check valves, as well as the two breather hoses. Also did the sea foam thing by pumping it through the Y-hose, letting it sit for a while and then ran the engine... all to no avail. Now my next step is to replace the driver's side air pump check valve and, while I have the valve removed, put a brush into the heads and try to clean up and carbon build up using sea foam.

Thing is I removed the intake manifold so I can replace the Y-hose a few weeks ago, and don't want to remove it again unless I really have to. Anyone out there has removed the pump check valve without removing the intake? Would appreciate any feedback on this.

Thx