Bank 1 lean and bank2 lean
I have the car there now and they found a leak on the intake manifold gasket, its a known problem with the M156, there is a SB for it. I talked to another member which had the same problem, they changed his intake gasket and used new bolts, he hasn't seen the CEL since.
The techs sprayed some brake cleaner around the intake gasket and got a rough idle at one spot, indicating a weak seal.
Its nothing major, its more to do with emissions, the ECU is really sensitive to these issues I am told.
You are supposed to use water.



