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Sorry for delay. I do need help still. I went on a trip and parked the Benz for a month. I asked the mechanic who to look it over. He says there is not a problem with the wiring. He says the code indicates a failing heater in the adblue system. I reset the check engine light and things stayed off for a few miles but then returned the P20BE and P20BEpd. So that's where I am at this point.