The aim is reducing an emission called NOx or "Nitrogen Oxides".
All these sensors work together so that the PCM can control emissions output. The 6.7L Powerstroke PCM monitors the conditions in the exhaust system by using 4 EGT sensors, 2 NoX sensors, a DPFE sensor for the particulate filter, and a particulate matter sensor. Reductant is the diesel exhaust fluid or DEF. Its such a generalized code that literally means the SCR system is not reducing NoX output effectively and could be because of the quality of the reductant. The actual definition of the code P207F is "Reductant Quality". In the case of the P207F, this code is informing you that your SCR system is not operating correctly. Essentially that means it a diagnostic trouble code that only sets during certain conditions, not when a hard fault is actually detected. This is what is known as a conditional DTC. This is one of the harder codes that a Powerstroke can throw at you because this code doesn't actually point to a specific problem.
One of the most common issues that people need help with on the 6.7L Powerstroke diesel engine is diagnosing a code P207F. 6.7L Powerstroke Diesel P207F Diagnostics Last Modified : Mar 30, 2021
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