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working on a neglected ML320. the codes that are comming up are Bank 1&2 trim malfunction. also 1, 2 , and 6 cylnders are missfire. I am about to change the plugs but not sure what will fix the bank problems. anyone have any ideas how I should go about fixing these problems?
 

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The missfire could be bad plug or spark coil. Check/replace the plugs first. Then, clear the code and run it again. Check codes again. If missfire reappears, change the coils from a working plug and clear codes. Run it and check again for codes. If another plug shows to missfire, your spark coil needs to be replaced.
As far as trim malfunction, MAF Sensor must be replaced. Try to clean it first with carburator cleaner solution. Don't touch the inside circuitry.
After cleaning or replacing the MAF, disconnect the battery for 10 minutes to reset the comp for air/fuil mix ration.
 
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