The error code p13df for a Mercedes vehicles means that Your ad blue sensor is faulty. You'll want to first get started by inspecting the wiring of the sensor. Look for any cracks or damage to the connectors. If You wiring looks good and fine then it's likely the sensor itself has gone bad and will need to be replaced. A new sensor will cost between $50 and $120. If You need to have a pro install it for You the total cost of parts and labor will be between $300 and $400.
Charles E
July 30, 2020
Code P13DF in a Mercedes means that there's a problem with the nox sensor
Tyson s
March 22, 2022
This fault come up with a nox sensor but on the dash the level sensor is reading faulty
All the other forums I have read say that fault is for a ad blue sensor
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