Solve Trouble Code P0037: What is the Meaning and Symptoms?

For transportation, people want to save some time with comfort. And the car provides both of them. For this reason, many people own a car. Maintaining a vehicle is not a very easy job. It would help if you learned some essential things to keep and drive your car safely. An onboard scanner attaches to every vehicle to find any problem it faces while moving. And this scanner provides you with some code that shows you where the problem is. When you find the trouble, you can quickly solve it. And P0037 is just like that. This code is related to the Heated oxygen sensor. You can learn all about this trouble code and solve tips for this problem.

Meaning of the Trouble code P0037:

P0037 Code= “Heated Oxygen Sensor Heater Control Circuit Low”

The generic code P0037 means the Heated Oxygen Sensor (Bank 1 Sensor 2) faces trouble operating while you drive the car. The problem is located in the downstream Oxygen sensor’s heating element, which attaches behind the catalytic converter. But this generic code sometimes varies with the model of the car and engine manufacturer. This problem is set when the Power control module finds a signal voltage from Oxygen sensor #2, which does not fall within the predefined range of the sensor. Bank 1 refers to the cylinder that has cylinder #1, and sensor #2 refers to the oxygen sensor behind the catalytic converter.

The reason behind the OBD2 code P0037:

There is some primary reason behind this trouble code P037; those are:

  1. The heater element of Bank 1, sensor 2, has failed
  2. Physical defect in heater sensor,
  3. Malfunction in Power Control Module or PCM.
  4. Damaged or loose connection wiring in the heater control circuit.

Common Symptoms:

If you learn about the symptoms of this trouble code, then you can easily find the issue. The symptoms are:

  1. Illuminated Malfunction indicator light,
  2. Failed emission test,
  3. Poor performance of the engine,
  4. The fuel economy is low.
  5. Inspect the Oxygen Sensor
  6. Check the Voltage
  7. Inspect the Fuse
  8. Test the Heater Resistance
  9. Check the Engine Control Module (ECM)

Diagnosis process of the Code P0037:

The diagnosis process is straightforward. Like:Diagnosis process of the Code P0037

  1. Check the default car screen; if there is another code you find with the p0037, delete it from memory and restart the system.
  2. Visually inspect the wiring system in the Bank 1 HO2S for damage or loose connection,
  3. Check the heater’s resistance to the heater element to remain in the specified range.
  4. Check the voltage of the O2 heater.
  5. If no voltage is found, check for any fault in the fuse or damage to the wire
  6.  check the ground heater, whether it is loose or not.

Note: Many times, you make a mistake in diagnosing the problem of P0037. So don’t replace the sensor if it’s not damaged. To avoid this, check all wiring connections of the system.

How to fix trouble code P0037?

 You need to follow some easy steps if you want to solve the problem by yourself. Those are: How to Fix P0037 Engine Code

  1. First, check any other code you find in the OBD scanner while the engine is turned off. Remove the code from memory, reset the whole system, take the car for a test drive, and scan the entire system. If the code doesn’t come back, it’s a false code. But in return, then, the problem happens in the system. 
  2. Now visually inspect if there is any damaged wire or blown fuse of any broken connectors. If you find any fault in there, replace or repair those.
  3. Then check the battery’s voltage and resistance; if it gives 12V and around  8 ohms, it’s good; if no voltage is found, the problem relates to an open or short circuit. And if resistance is more than 10%, then the code is active.
  4. After that, check the ground of the system; the loose or damaged connection is the reason behind this trouble code. Fix the connection If you notice any.
  5. If still, you find the code in the car dashboard, then the problem is related to the oxygen sensor. Replace the whole sensor and recheck the system.

After following every step, I think you can quickly solve this issue. But after doing all this, if you find the code again, you need help from a professional. 

The seriousness of this error code:

 The generic trouble code P0037 doesn’t create any problems while you are driving your car. You notice the illuminated light of the malfunction indicator. But you face some issues like sensor loop error, failed emission test, high fuel consumption, poor operating system, and gradually it damages another system. It’ll cost you more if you neglect this problem. So try to fix the issue as soon as possible.


The trouble code P0037 is not a significant problem at the first stage. If you fix this issue at the beginning, it’ll cost about $75-%150. But if you neglect and damage another system, it’ll cost more than a thousand dollars. To fix the issue and save money.

Kevin Nicholas is an automotive technician who is a genius at software and hardware-related issues. He manually tested more than a hundred OBD scanners and gave his honest opinion on whether the device was worth the money or not. His in-depth OBD review articles help people choose the right product, whether it is a European, American, or Asian vehicle. He completed his Automotive Specialized Training Course at Universal Technical Institute and has more than 15 years of experience in the field.

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