Trouble Code P0036 HO2S Heater Control Circuit Bank 1 Sensor 2 price This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, Toyota  , VW, Ford, Hyundai, Dodge, Honda, Chevrolet,  Audi, Acura, etc. Specific repair steps may vary depending on the model.  The oxygen sensors used 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 the Powertrain Control Module (PCM) / Engine Control Module (ECM) 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 seperate ground wire. Trouble Code P0036 HO2S Heater Control Circuit Bank 1 Sensor 2 price  The heater circuit may be supplied power or ground by the PCM/ECM or another source that can be controlled by the PCM/ECM.  This sensor is also after the catalytic converter, so it will not affect the air/fuel ratio input to the PCM/ECM; it is primarily used to verify the catalytic converters efficiency. Causes Potential causes of a P0036 Open circuit inside oxygen sensor or open power or ground wires to oxygen sensor Exhaust system ground strap may have become corroded or broken PCM/ECM or oxygen sensor heater circuit wiring has failed Possible Solutions Visually inspect the oxygen sensor wiring for damaged or loose wiring to the sensor.  The heater circuit inside the sensor should have some resistance present, excessive resistance or an over limit reading would indicate an open in the heated portion of the circuit and the oxygen sensor will need to be replaced. Back-probe the ground wire at the connector and check for resistance between a good known ground and the connector to the oxygen sensor. Back-probe the power supply wire at the connector with the DVOM set to DC volts with the positive lead on the power supply wire and the negative lead at a good known ground to check for power to supply at the oxygen sensor. If no power is present at the connector during initial car startup (cold start), there may be a problem with the power supply circuit to the oxygen sensor or the PCM itself.