...I have had only once engine light on (this far) and that for different fault code. Interesting thing is that I have the same fault code "31103 - SCR NOx Catalyst Bank 1, P20EE 00 [039] - Efficiency too Low" sitting in my ECU but it hasn't turned on the light.
Currently I'm driving with a...
In the VCDS coding for plain "31103"
31103 - SCR NOx Catalyst Bank 1
P20EE 00 [039] - Efficiency too Low
Grabbed the above out of the engine (CXFA) with a VCDS. It was also confirmed at the dealer. It didn't turn on the light.
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