A circuit for determining and/or compensating for a measurement error of a sheathed sensor due to a property of a sheath of said sheathed sensor, the circuit comprising: - a first terminal and a second terminal for connecting to a pair of sensor signal leads (12,13) of a sensor element in a sheathed sensor; - a voltage measurement circuit for measuring a voltage difference (Vd) between said first terminal and said second terminal and generating a measurement signal indicative of said measured voltage difference; and - a switching unit for controllably switching an electrical connection; characterised in that: - the switching unit is adapted for controllably switching an electrical connection between a first state and a second state in which the first terminal is electrically connected to respectively a first reference voltage and a second reference voltage (V 2); and in that the circuit further comprises: - a correction measurement circuit adapted for measuring a current running from the first terminal through the switching unit and for generating a correction signal indicative of said current; and - a controller adapted for receiving said measurement signal and said correction signal in said first state and said second state by controlling said switching of said switching unit, the controller being further adapted for calculating an error value indicative of said measurement error and/or a sensor readout value that is corrected for said measurement error by taking said measurement signal and said correction signal into account as generated in both said first state and said second state. - a first terminal and a second terminal for connecting to a pair of sensor signal leads (12,13) of a sensor element in a sheathed sensor; - a voltage measurement circuit for measuring a voltage difference (Vd) between said first terminal and said second terminal and generating a measurement signal indicative of said measured voltage difference; and - a switching unit for controllably switching an electrical connection; - the switching unit is adapted for controllably switching an electrical connection between a first state and a second state in which the first terminal is electrically connected to respectively a first reference voltage and a second reference voltage (V 2); and in that the circuit further comprises: - a correction measurement circuit adapted for measuring a current running from the first terminal through the switching unit and for generating a correction signal indicative of said current; and - a controller adapted for receiving said measurement signal and said correction signal in said first state and said second state by controlling said switching of said switching unit, the controller being further adapted for calculating an error value indicative of said measurement error and/or a sensor readout value that is corrected for said measurement error by taking said measurement signal and said correction signal into account as generated in both said first state and said second state. - a correction measurement circuit adapted for measuring a current running from the first terminal through the switching unit and for generating a correction signal indicative of said current; and - a controller adapted for receiving said measurement signal and said correction signal in said first state and said second state by controlling said switching of said switching unit, the controller being further adapted for calculating an error value indicative of said measurement error and/or a sensor readout value that is corrected for said measurement error by taking said measurement signal and said correction signal into account as generated in both said first state and said second state.