Question

P20BE on my 2011 Mercedes Benz Sprinter changed o2 sensor code still comes back what do i do? we have changed upstream sensor code comes back at various times

Answer 1

Start by checking the Adblue Tank Heater wiring and connection, if the connection is OK, then the Adblue Tank Heater is the most likely cause of the problem.

P20BE MERCEDES-BENZ - Reductant Heater 'B' Control Circuit Performance
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