Guide To P0038 OBD Error Code Solutions

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OBD error code P0038 is a generic error code. Now you must be wondering what does this term generic code means. Generic codes are the code that apply to all makes and models.

So, what is this OBD error code P0038 about? This error code indicates that there is some issue with your HO2S heater control circuit (Bank 1 Sensor 2), i.e. it is high. If you wish to know more about this error code you will need to go through the subsequent sections.

As we all that the oxygen sensor is meant to measure the oxygen content in the gases coming out of the exhaust after the engine’s combustion process. Your vehicle’s oxygen sensor needs to be at a certain temperature to operate accurately and for information to be accurate. OBD error code P0038 will be set by the PCM (powertrain control module) when it detects that the heater wire is not operating.

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

• Burnt out wires due to excessive exhaust heat
• Short circuits due to burnt wirings
• Road debris causing impact damage or corroded connectors
• Poor ground connections can become a potential cause
• Heater control circuit blown out fuses

1. Oxygen Sensor - Need to undergo oxygen sensor replacement? If Yes, then you have arrived at the right place. We have in stock for you high end oxygen sensors from top brands like Denso, Bosch and many more.
2. Exhaust System & Parts - If you need any of the exhaust system parts to fix this obd error code P0038, then all you need to do is to browse through our website to find your trophy parts.
3. Powertrain Control Module - Chances are that your PCM, itself is damaged and is demanding for a quick change.
4. Diagnostic Tools - If you need any of the DIY diagnostic tools, to diagnose the issues with your cars. You can find them all with us.

Whether you own a Mazda or Toyota or any other make, the symptoms for this error code is going to be more or less the same. The only difference can be with regard to the extent of the issue, or in other words the severity of the problems. Let’s have a look at few of its common symptoms.

Common Symptoms

• Illumination of the check engine light
• There might be a reach-running or lean-running condition
• Lack of power
• Increase in fuel consumption
• Difficulty in start
• Tailpipe emitting black smoke

If you wish to correct this problem, there is not really much you can do other than replacing the oxygen sensor and related parts (wirings, connectors etc) if damaged.

In case the wiring and connectors are discovered to be in a good condition, you will need to unplug the HO2S bank 1 sensor 2 to check for 12V B+.

Also check if the heater control circuit is intact or not. In case it is intact, you will need to remove the oxygen sensor and check for any signs of damage. You will need to use the Ohmmeter and perform a resistance test to the heater element. In case of infinite resistance, replace the oxygen sensor.

Just remember that proper functioning oxygen sensor is extremely important for the smooth functioning of your engine.

If you need any parts to fix this problem you can easily find them with us. Not only that we also have in stock the best in range auto parts and that too at the most budget friendly prices ever online.

In order to diagnose this error code P0038 you will need to follow the below stated steps.

• First of all, you will need to conduct a visual check of all the wirings and connecters connected to the troubled components (heated oxygen sensor heater circuit control).
• Next, check for any signs of broken connectors or burnt/shorted/damaged wirings.
• Once you know the issue or the damaged parts, immediately resort to replace it.
• Also, make sure to check the associated fuses in your initial inspection of wirings. Also keep in mind that that on some applications, fused circuit B requires the input voltage.
• Now, if the error code still persists, undergo the continuity and resistance tests for all the wirings that are associated with the trouble’s parts.
• Next, you will need to check the oxygen sensors for any signs of discoloration or deposits. You need to keep one thing in mind that you can’t clean the oxygen sensor of any deposits. The only possible remedy is to replace the sensor and use premium oil and fuel that guarantee no additives.

Lastly, re-check to see if the error codes still exists.

Common Mistakes When Diagnosing The P0038 Code

The most common mistakes that people are likely to commit while diagnosing this error code is that of replacing the oxygen sensor even when it’s not at fault. The root cause of the problem was not oxygen sensors but lean or rich engine conditions that were causing incorrect readings.

Another common mistake could be replacing the incorrect oxygen sensor.