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Disconnect D.P.F. EGR sensor.
Key on, engine off.
Measure voltage between the sensor VREF circuit and SIG RTN circuit at the D.P.F. EGR sensor vehicle harness connector.
Is VREF voltage between 4.0 and 6.0 volts?
if the connector has these values when unplugged from dpfe sensor the dpfe sensor is bad.
which would be the same as unplugging sensor and seeing if code P0402 excess flow it tripped.
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