Quote:
Originally Posted by JamesInSJ
Did you run tests on ISTA before you changed NOX sensor, clear codes, shut down and replace it? Codes from previous errors remain after a replacement, but on a test scan would show as "not present." At that point, you can clear codes and then see what comes up so you know what you may (or may not) still have to deal with.
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I run the test after i replaced the sensor. However, I don't think the car had time to go to sleep / apply reset request prior to me running the test.
So, it may've been an old code.