Intake Air leak - ML350
 

Hi all,

Trying to keep my wife’s ML350 out of the dealer -
CEL on -
Codes - 0745,0749 - Bank 1 and 2 too lean
0521 - Charge flap movement malfunction
2091 - bank 1 to lean at idle
2095 - bank 2 to lean at idle
0620 - leak detected in intake system

I checked 02 sensors and both are operating normally.

Vehicle runs mostly fine. Idle RPMs bounce a bit -

We did have two occasions this past weekend where the car wouldn’t start after it was just shut off - it wouldn’t fire up. I had to attempt multiple starts and give more gas to start.


I performed a smoke test (to the best of my ability) and couldn’t identify and major leaks. There was some coming out of the back where the MAS is.

Any recommendations on next steps?

Thanks all -