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What is code P0031 on a 1999 Volvo mean?

Code P0031 in a 1999 Volvo indicates a problem with the Heated Oxygen Sensor (HO2S) heater circuit in Bank 1 Sensor 1. This sensor is located in the exhaust system and is responsible for detecting the amount of oxygen in the exhaust gases. The heater circuit is responsible for heating the sensor to a specific temperature in order for the sensor to function properly. If the heater circuit is not working properly, the sensor cannot send accurate information to the engine control module (ECM), which can cause the engine to run poorly and potentially damage the catalytic converter.