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Engine light on after replacing DEF Heater and Pump OBCII gave code P20e9 but I can't find the explination of the code. Not a full time mechanic just an 74 year old golf pro who likes to work on his OLD car. :) Thanks
What makes this problem better or worse?
0
How long has your 2009 Mercedes-Benz ML320 had this problem?
couple of days
1 Reply
I do not see P20E9 in the workshop manual for a 2009 Mercedes Benz ML320. Perhaps I don't have complete information, but I'm wondering if it's a typographical error. Nonetheless, here's the info we have on RepairPal: https://repairpal.com/obd-ii-code-p20e9-reductant-pressure-too-high