DTC P00D1-00: HO2S Heater Control Circuit Range/Performance Bank 1 Sensor 1: General Description
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
The normal operating temperature of the Heated Oxygen Sensor (HO2S) ranges from 350 to 850°C (662 to 1562°F). HO2S heater greatly decreases the amount of time required for fuel control to become active. The ECM provides a pulse width modulated control signal to adjust current through the heater. When HO2S is cold, the value of the resistance is low and the current in the circuit is high. On the contrary, if the temperature in the resistor of the HO2S rises, the current drops gradually.