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The P20EE code indicates an issue with the vehicle’s catalyst efficiency. It’s a generic diagnostic trouble code that generally has to do with how your vehicle is converting NOx to nitrogen and water using the diesel exhaust fluid (DEF). If the reductant catalyst system isn’t converting NOx to nitrogen appropriately, you’ll see this code, which just generally indicates that it’s fallen below a previously noted efficiency threshold.
More About the P20EE Code
In a diesel engine, you’ll find a reductant catalyst system. This helps the vehicle turn nitrogen oxide (NOx) into nitrogen, helping to dramatically reduce the number of potentially dangerous NOx molecules that it puts out into the atmosphere. The selective catalytic reduction (SCR) system injects DEF into the exhaust system before the catalytic converter, which raises the temperature, improving the system’s efficiency. Not only does it help the vehicle convert more NOx, but it also helps the vehicle’s catalytic converters last longer.
