P220f and P004 fault code e220d 2016

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Paul Mehew

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Oct 30, 2018
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Your Mercedes
CLK 200 K 2009
Hi, my 2016 e220d was showing fault code P220f a couple of weeks ago. I was now getting around to fixing and replacing the first NOX sensor but before doing this ran the test again to see if fault code was still showing, and now have the fault code P0004 instead which is a full regulator control error. Therefore can anyone advise if I replace the NOX sensor as originally planned this will solve the P0004 issue. Thanks
 
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