Mercedes-Benz Forum - View Single Post - P0400 Code!!!
Thread: P0400 Code!!!
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post #3 of Old 08-14-2019, 01:47 PM
Join Date: Dec 2016
Vehicle: 1999 ML430, 2000 ML320, 2005 E500 4matic wagon
Location: Wisconsin
Posts: 142
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Where the exhaust port is underneath the EGR valve is exhaust coming out?

If so the exhaust port needs to be cleaned. Please post back so I can post the instructions if needed.
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