p0037 Heated Oxygen Sensor  ho2s heater control circuit low (bank 1 sensor 2)      Heated Oxygen Sensor (HO2S) Heater Control Circuit This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, Toyota  Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Acura, etc. Specific repair steps may vary depending on the model. Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. The PCM uses the information gained from the Bank 1,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element   The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. p0037 Heated Oxygen Sensor  ho2s heater control circuit low     Heated Oxygen Sensor (HO2S) Heater Control Circuit The P0037 is a fairly straight forward code pointing to a problem with the oxygen sensor for bank1/sensor2. Unfortunately, this will not be a fuse issue, as there is no one fuse that protects "just" that sensor. The sensor is located under the vehicle, mounted to the exhaust pipe, behind the catalytic converter. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If no problems are found, the sensor will need to be replaced. These are actually fairly common wear and tear fail items on these car. Do a visual inspection of the Bank 1, 2 HO2S and wiring harness. If there is any damage to the sensor or any damage to the wiring, repair/replace as needed. Make sure wiring is routed away from exhaust. If all appears okay, unplug the Bank 1, 2 HO2S and verify that there is 12 volts B+ present with the key on engine off, . Verify the heater control circuit is intact. If so, remove the o2 sensor and inspect for damage. Verify the heater control  circuit is intact. If so, remove the o2 sensor and inspect for damage. If you have access to resistance specifications you can use a Ohmmeter to perform a resistance test of the heater element. Infinite resistance indicates an open in the heater. Replace the o2 sensor as necessary.