Mercedes-Benz Forum - View Single Post - P0400 Code!!!
Thread: P0400 Code!!!
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post #7 of Old 08-16-2019, 08:39 AM
Join Date: Dec 2016
Vehicle: 1999 ML430, 2000 ML320, 2005 E500 4matic wagon
Location: Wisconsin
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Cleaning out the ports does work. I have had success using the BG 221 and a small brass gun cleaning brush.
That was over 100,000 miles ago and the problem has stayed away.
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