P0037 - HO2S HEATER CONTROL CIRCUIT LOW (BANK 1, SENSOR 2)
Description of DTC code P0037
The Oxygen Sensors send information to the Power Train Control Module (PCM) to determine the amount of oxygen found in the exhaust system. This code refers to bank 1, sensor 2, which is the second sensor located in bank number 1. With the information that the Oxygen Sensor sends to the PCM (Powertrain Control Module), the functioning of the TWC (catalytic converter) is also checked.
It should be noted that the Oxygen Sensors (O2) include a heating element, which is controlled by the PCM to heat the O2 to the temperature necessary for operation. This with the aim of reducing emissions and entering more quickly in closed circuit.
The PCM constantly monitors the heater circuits in order to locate voltages outside the expected range. If the PCM detects that there is a voltage condition below the normal range, the DTC code P0037 OBD2 is set.
Symptoms of fault code P0037
- Check Engine light illumination.
- Lack of power.
- Vacillation of the motor.
Causes of OBD2 P0037
When the fault code P0037 OBD II is established, it means that one or more of the following problems has occurred:
- The voltage supply circuit of the heating element may be short.
- Short circuit to earth in the heater circuit.
- Oxygen Sensor heating element number 2 may be defective.
- Oxygen Sensor defective.
Possible solutions of the DTC code P0037
To solve the problems of diagnostic code P0037 you must do the following:
- Perform an inspection of the Oxygen Sensor number 2, which is located in bank number 1. Verify that the cables are not worn or rubbed with any other component. Repair to change as necessary. Also, you must ensure that the cables have a considerable distance to the exhaust.
- If there are no problems, disconnect the O2 Sensor and check that there are 12 volts. This test must be carried out with the key in the on position and the engine off. In the same way, verify the earth. Repair or change related components if you encounter problems.
- If both circuits are OK, remove the Oxygen Sensor for damage. Change if necessary.
- With an ohmmeter, check the resistance of the heating element, compare with the factory specifications. If they are not within the range, or the resistance is infinite, Change the Oxygen Sensor.