Good morning we have in the workshop a Kia Rio license plateFR 957 PP 1.1 crdi D3FA that has error P2454...replaced and initialised differential pressure sensor...did a forced regeneration and from the parameters it seems that the fap is free....I noticed that the output voltage from the sensor is 135 volts ... I have seen from the MM manual that with pressure at 0 you should have 1 volt ... the mil light flashes if I reset the error is cleared but then returns ... Is there perhaps some particular procedure that I missed?