W245 B 180 cdi P0408 error

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brodev

New Member
Joined
Jul 29, 2014
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4
Car
b180
Every 2/3 weeks when I start my 2011 B180 cdi car I get an engine warning lamp come on. It gives a p0408 error which resets and the car is fine for another 2/3 weeks. This has happened about 10/15 miles after a motorway run so it is not driving condition induced. Any ideas or do I have little to worry about?
 
At the top under sticky is a fault code list, it reads P0408 Exhaust Gas Recirculation Sensor “B” Circuit High
 

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