A particulate matter (PM) sensor circuit arrangement including a PM sensor ; said PM sensor including integral therewith: a PM sensor resistor ; an RTD resistor and a heater resistor , said PM sensor including four electrical terminals, of which: a) a first electrical terminal being connected to one terminal of said PM sensor resistor ; b) a second electrical terminal being connected to one terminal side of said RTD resistor ; c) a third electrical terminal being connected to one terminal of the heater resistor ; d) a fourth common electrical terminal being connected to respective opposite terminals of said PM sensor resistor , RTD resistor and heater resistor to said first, second and third electrical terminals; characterized in that the PM sensor circuit arrangement further includes intermediate circuitry and a controller or microprocessor, the controller or microprocessor being connected to said PM sensor via said intermediate circuitry ; in that the intermediate circuitry includes a boost voltage supply , a heater low side driver and a heater high side driver , in that the boost voltage supply and the heater low side driver are connected to the fourth common electrical terminal , in that the heater high side driver is connected to the third electrical terminal ; in that the controller or microprocessor is configured to selectively operationally enable the boost voltage supply in a first mode in which the PM sensor resistance is monitored, and to selectively operationally enable the heater low side driver in a second mode for regeneration of the PM sensor resistor ; in that the controller or microprocessor is configured to selectively operationally disable the boost voltage supply in the second mode, and to selectively operationally disable the heater low side driver in the first mode, in that the controller or microprocessor is configured to selectively operationally enable the heater high side driver in the second mode, and to selectively operationally disable the heater high side driver in the first mode; and in that said first electrical terminal is connected at a voltage which is lower than at said boost voltage supply . a) a first electrical terminal being connected to one terminal of said PM sensor resistor ; b) a second electrical terminal being connected to one terminal side of said RTD resistor ; c) a third electrical terminal being connected to one terminal of the heater resistor ; d) a fourth common electrical terminal being connected to respective opposite terminals of said PM sensor resistor , RTD resistor and heater resistor to said first, second and third electrical terminals; the intermediate circuitry includes a boost voltage supply , a heater low side driver and a heater high side driver , in that the boost voltage supply and the heater low side driver are connected to the fourth common electrical terminal , in that the heater high side driver is connected to the third electrical terminal ; in that the controller or microprocessor is configured to selectively operationally enable the boost voltage supply in a first mode in which the PM sensor resistance is monitored, and to selectively operationally enable the heater low side driver in a second mode for regeneration of the PM sensor resistor ; in that the controller or microprocessor is configured to selectively operationally disable the boost voltage supply in the second mode, and to selectively operationally disable the heater low side driver in the first mode, in that the controller or microprocessor is configured to selectively operationally enable the heater high side driver in the second mode, and to selectively operationally disable the heater high side driver in the first mode; and in that said first electrical terminal is connected at a voltage which is lower than at said boost voltage supply . <EOS>