p0038 Code ho2s Heated Oxygen Sensor Heater Control heater control circuit high (bank 1 sensor 2) This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Nissan, etc. Specific repair steps may vary depending on the model.  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. Two dedicated to the oxygen sensor and two dedicated to the heater element. The oxygen sensor heater basically decreases the time needed to achieve closed loop. The PCM controls the heater on-time. The PCM also continuously monitors the heater circuits for abnormal voltages or in some cases, even abnormal amperages. p0038 Code ho2s Heated Oxygen Sensor Heater Control heater control circuit high (bank 1 sensor 2)  Finding out which one you have is important because the PCM activates the heater under various circumstances. If the PCM detects an abnormally high voltage condition on the heater circuit, P0038 may set. This code is only referring to the heating circuitry half of the Oxygen sensor. Symptoms Symptoms of a P0038 DTC may include: MIL (Malfunction indicator lamp) illumination There would likely be no other symptoms. If there is any damage to the sensor or any damage to the wiring, fix it as needed. Check for bare wires where wiring enters sensor. This often can fatigue and cause shorts. Make sure wiring is routed away from exhaust.