Mercedes Benz E230 (W211) 7G engine MIL

[riverview]

Hey guys,

i was wondering if anyone could help me out.
i have a MB E230 with the following fault codes,

1) 0746 self-adaptation of mixture formation for enleanment at idle for the RIGHT cylinder bank is below the permissible limit. (P0172)

2) 0750 self-adaptation of mixture formation for enleanment at idle for the LEFT cylinder bank is below the permissible limit. (P0175)

so far i have tried,

-replacing the Air-Mass sensor
(waited for 2-3 days)

-replacing the Oxygen sensor
(waited for 2-3 days)

-updating the ECU

But, the engine check-light and fault codes keep reappearing.
Anyone have any advise?

[yriy66]

intake manifold has a hole-replacement.

[oldford]

?????????????????????????????

[agabna]

hello
i think these problem from the type of gazolin so it better to match it at the ecu
octane (89-90---)
and you can adjust the mixture

[Rocinante]

The intake manifolds have an issue where the flap rods rub holes in the back by the throttle body, also they flap pivot point in the front fall apart. Both causing vacuum leaks. The other common vacuum leak is the crank case vent hose gets soft and leaks. Take is completely off and inspect it.