Hi,

Purchased 2009 b200 turbo with only 109,000 kms. I have code P0491 Secondary air injection systemInsufficient flow bank one. How would I go about fixing this issue? It seems to come on every 3-4 days and I clear it however I would like to Permanently fix it. Can it be the check Value ?

also any recommendations on the transmission? Should have it serviced ?

Please add if I missed anything or any other recommendations in maintaining this Vehicle.