Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 311 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent P0031 -12 - HO2S Heater Control Circuit Low Bank 1 Sensor 1 This O2 sensor may also be referred to as an air/fuel ratio sensor since on some vehicles it is. It detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the A/F O2 sensor. Essentially this P0031 code means that the resistance of the heater circuit is lower than normal Overview: Code Cause Effect on Vehicle Fault Code: P0031-12 6. A short or open in the heater circuit in the sensor 7. A failed O2 sensor heater 8. Wiring/connectors broken/frayed leading to sensor and/or relay 9. Failed PCM/ECM Most likely you'll not notice any symptoms other than the MIL Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check for any short or open in the heater circuit in the sensor Continuity Step 2 Check for O2 sensor functionality Functionality Step 3 Check for Wiring/connectors broken/frayed leading to sensor and/or relay Physical check Step 4 Check ECU Functionality Circuit Schematic Diagram:
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