P0037 OBD Error Code: Problem & Solutions

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Have you ever wondered why do you need a well-functioning heater oxygen sensor? You need them because your vehicle’s PCM, also known as the powertrain control module uses them to determine the oxygen content in the exhaust system. Now you must be wondering what does bank 1, sensor 2 means! Well, bank 1 and sensor 2 refers to the second sensor back on bank.

Now coming to the question why and when does the PCM sets the OBD error code P0037? To know the answer, you will need to go through the subsequent sections of this article.

We understand how you feel when your vehicle is diagnosed with some alien code like P0037. You must be curious to know what this code it and what causes it. We have answers to all of these.

If the powertrain control module of your vehicle detects that there is an abnormally low voltage condition on the heater circuit, it will set OBD error code P0037. Now, let's have a look at few of the common causes behind this code.

What causes this problem with the HO2S Heater Control Circuit (Bank 1 Sensor 2)?

• Wiring that run too close the exhaust system might be burnt out
• Burnt wiring causing short circuits
• Corroded connectors
• Poor ground connections
• Issues with battery voltage such as low battery voltage
• Heater control circuit blown out fuses

1. Heated Oxygen Sensors - Facing OBD error code P0037? Chances are that you might need to undergo HO2S (heated oxygen sensor) replacement. We have in stock high end HO2S for every make and model on the Canadian roads.
2. Oxygen Sensor - Do you need top notch Oxygen sensors for your vehicle? If yes, then you have arrived at the right place. We have in stock top quality and top brands oxygen sensor such as Bosch oxygen sensors and more. So, don’t think twice and undergo that needed oxygen sensor replacement.
3. Powertrain Control Module - If you need powertrain control module to fix this problem, all you need to do is to browse through our website. You can find the most budget friendly PCM’s with us.
4. Catalytic Converter - We also have in stock high end Catalytic Converters for every make and model on the Canadian road. All you need to do get them is to browse through our website and order your needed parts.
5. Exhaust System & Parts - Chances are one or more of your exhaust system parts are not working well, causing a damage to the sensors wiring and connectors. So, it will be definitely a good idea to check and replace the damaged parts.
6. Engine Control Module - We also have in stock high end Engine Control Modules to help you out with any problems related to it.
7. Diagnostic Tools - Need to diagnostic tools to become that ideal DIY guy? If your answer is YES, then you can find a wide selection of diagnostic tools with us.

You can spot this OBD error code P0037 if you experience few of these symptoms with your vehicle.

Common Symptoms

• Illumination of malfunction indicator lamp
• The vehicle will enter the failsafe mode and will continue to be there until the problem is repair
• Illumination of check engine light

Other Drivability issues can be:

• Hesitation
• Rough running
• Lack of power

Do you really wish to get rid of this problem with your vehicle? Well, to do so you will need to follow few steps as mentioned below

• First of all, get a certified technician to check your vehicle to verify this error code P0037. Get him to perform a road test after resetting the fault codes.
• In case the code returns, then you will need to follow the test procedure. Your vehicle might have several problems but the most common is wiring being damaged by the excessive exhaust heat.
• Next, make sure that the wiring is in good condition and also has a proper voltage and ground to the sensor before you replace the sensor.

If you need any of the parts such as engine wirings, diagnostic tools or an oxygen sensor to correct this error code you can simply browse through our auto parts collection. We have in stock not only the best priced product but also parts from top brands.

In order to diagnose this error code with your vehicle’s Heated Oxygen Sensor Heater Control Circuit being low, you will need an OBD-II scanner.

You will need to conduct a test and then a re-test to see if the code returns. In case it comes back, you will need to diagnose the sensor for both - the power and the ground (along with its wiring). Chances are the error code is flashing because of a defective wiring (Damaged due to excessive exhaust heat).

Common mistakes when diagnosing the P0037 code

While conducting a diagnosis for OBD error code P0037, there are chances that you end up with committing few errors. To help you in preventing these errors we have worked a list of ‘What to Do & What Not to Do’.

• Don’t replace the HO2S before you check all the wiring and connectors related to it, because chances are only, they are damaged because of the excessive exhaust heat.
• Make sure that there is 12 volts to sensor and also the ground is good.
• Also, do check both sides of the connector wiring to make sure that the connector is good.