Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2019 ford ranger dtc P0420 & P0406 egr A flow excessive and EGR sensor "A" circuit high
Wow, I didn't think there was an EGR valve on any modern gasoline engines.
I'm not familiar with that vehicle or system, but I would look for a bidrectional test with the scan tool and see if the DPFE value changes with EGR steps and also if the engine begins to run rough. I'll link in some YouTube videos of Scanner Danner testing older Ford EGR systems. If it's still the same basic idea, DPFE signal voltage should be 0.5v-1.0v @ idle with no EGR Flow, and over 4v with and open EGR.
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