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What is your question?
P0173-Fuel Trim Malf (Bank 2), P0170-Fuel Trim Malf (Bank 1), P0100-Mass or Volume Air Flow Circuit Malf, P0400-Exhaust Gas Recirculation Flow Malf, P0700-Transmission Control Sys Malf and my check engine light bulb is out.

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In most states, any malfunction codes in the ECU will cause it to fail inspection. In addition, these codes indicate that the car isn't running properly. There for, the emissions are not correct. I recommend having a professional diagnose and repair the vehicle for you to restore it's proper running.
The mechanic replaced the Mass Airflow Sensor, cleaned the EGR valve and ports, put in a new check engine light yellow bulb. The Check Engine Light was off, then after a couple of miles, the check engine light came back on. I drove straight to the mechanic, he checked it, code P0400 EGR popped up again!
Hello, my ML320 is having this exact problem. What can I do to fix it. My mechanic tried to solve the problem and it is coming right back.