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Both Nox sensors at fault and replaced by Mercedes under warranty.

Found the generic coding in relation to my codes: P2BAD (AdBlue/DEF system and listed many different causes) and P13E4(Cylinder 5, sensor)

Thanks. Checked the AdBlue full level in the service menu and it states full. So it’s not the AdBlue tank sensor.

Hi All, My first post here so please bear with me. Purchased a 2014 ML250 Bluetec recently. The check AdBlue warning and engine light came on and I filled tank up with 12 litres of AdBlue. Have driven car over 300miles and lights are still appearing. Have 100 miles remaining on count down...