Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 317 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 P0036 -13 - HO2S Heater Control Circuit High Bank 1 Sensor 1 The oxygen sensors use a heated circuit to warm up the sensor for faster feedback operation. The oxygen sensor may use three or four wires depending on the vehicle, two are usually used for the sensor feedback to EMS ECU and the other wires are for the heater to power the heated circuit. Three wire sensors are usually grounded through the exhaust system, and four wire sensors have a separate ground wire. The P0036 code refers to the sensor after the catalytic converter on bank 1, which is on the side of the engine with the #1 cylinder. The heater circuit may be supplied power or ground by the EMS ECU. Overview: Code Cause Effect on Vehicle Fault Code: P0036-13 1. Open circuit inside oxygen sensor or open power or ground wires to oxygen sensor 2. Exhaust system ground strap may have become corroded or broken 3. Failed EMS ECU 4. Failed oxygen sensor heater circuit wiring has failed Most likely you'll not notice any symptoms other than the MIL Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check for any open circuit inside oxygen sensor Continuity Step 2 Check for corrosion at exhaust system Functionality Step 3 Check for Wiring/connectors broken/frayed leading to sensor and/or relay Physical check Step 4 Check oxygen sensor heater circuit wiring Functionality Step 5 Check ECU Functionality
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