Before I spent any money deleting stuff I'd try the free recall work. If NOX1 is bad and giving false readings, when the PCM compares NOX2 with NOX1 to see if the SCR/DEF is working, it gets an invalid result and thinks the NOX reduction system isn't working.
The new calibration is supposed to help with the false error condition, too.
Also, if they do the recall work, the DEF is known good and the DEF injector is working, it points at a bad SCR catalyst, which is an emission system component and covered anyway.
See:
https://www.engine-codes.com/p20ee.html
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Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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