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DTC P0037: Ho2S Heater Control Circuit Low: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Saturn SW2, 2001 Saturn SL2, 2001 Saturn SL1, 2001 Saturn SL, and 2001 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.

HO2S2 is located behind catalytic converter. Sensor is used by PCM to determine oxygen storage capability of catalytic converter. Heater in sensor speeds up sensor activation time. PCM commands heater on after the first 45 seconds of engine run time and turns off when engine is turned off. DTC will set when heater current draw is too low when heater is commanded on.

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