P0143 - OBD Trouble Code

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OBD error code P0143 is a generic OBD error code that indicates that oxygen sensor circuit for bank 1 sensor 3 has a low voltage. To know more about this generic error code, you will need to go through our subsequent sections. We have listed out few common causes and symptoms related to this error code, along with the ways and means to diagnose and correct it.

OBD error code P0143 will be set by the PCM when it detects that the post-cat o2 sensor has low voltage for a long time. Powertrain control module detects that the HO2S signal is less than the 156 mv for 28 seconds. The common causes behind this low voltage issue within the o2 sensor circuit are highlighted below.

What causes this problem with the O2 sensor circuit (Bank 1 Sensor 3)?

• Failed powertrain control module
• False reading due to air leaks in exhaust in front of the o2 sensor
• Damaged or defective o2 sensor connectors
• Shorted to ground o2 sensor signal circuits
• O2 sensor contaminated due to fuel or coolant, resulting in its failure

1. Oxygen Sensor - if you are facing OBD error code P0143, chances are that your vehicle demands an oxygen sensor replacement. Don’t worry as 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. Mass Air Flow sensor - If you need MAF sensors to fix your car then we have good news for you. We have in stock not only high end MAF sensors but we also have them for all makes and models. So, what are you waiting for? Just dive into the pool of best auto parts.
3. Manifold Absolute Pressure Sensor - Looking for manifold absolute pressure sensor to fix this problem? If YES, then all you need to do is to browse through our website. You can find the most budget friendly parts with us.
4. Powertrain Control Module - OBD error code P0143 flashing? There is a chance that your PCM, itself is damaged and is demanding for a quick change. So, what are you waiting for? Buy a new one with us now.
5. Engine Control Module - ECM if damaged can be really problematic. So, we advise you to undergo ECM replacement as soon as possible, if found damaged. Worried about the cost? Well, you no longer need to worry about that as we have for you best priced ECM’S in stock.
6. Fuel Pump - If you need fuel pumps to fix this problem, all you need to do is to browse through our website. You can find the most budget friendly fuel pumps with us.
7. Exhaust Systems & Parts - Looking for exhaust components such as exhaust manifold, cat converters and more for your vehicle make? If yes, then you can easily find that with us.
8. 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.
9. Spark Plugs - We have in stock high end spark plugs for all make and models for you. So, what are you waiting for? Make the best parts yours today.

Chances are that if you are facing OBD error code P0143, you won’t face much drivability issues. But there are significant other common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Illumination of MIL or CEL (Check engine light)
• Vehicle may fail the emissions test in some cases
• Increase in the NOx emissions
• Issues with engine performance
• Rough running of the engine
• Poor idling and engine running rich
• Problem with the downstream catalyst O2 sensor 3 for bank 1

After understanding the symptoms and few common causes behind the OBD error code, we are here to help you out in understanding the ways and means to correct the issue. To solve any issue, you need to follow certain steps, and to solve OBD error code P0143, you will need to follow the following steps:

• First and foremost, thing that you should do is to repair the leaks from the exhaust before the catalyst as the excessive O2 in the exhaust can lead to low voltage in the 02 sensor.
• After that you should repair or replace the wirings or connections to the O2 sensor for bank 1 sensor 3.
• In the last make sure you replace the damaged or defective O2 sensors.

To do all this, you will need few high-quality auto parts such as Oxygen sensors, oxygen sensor wiring and connectors and so on. From where will you get them? From your local store? Well, why go there when you can order quality parts with us while sitting in the comfort of your home. So, just browse through our website and order your needed parts today.

Diagnosing a problem is not easy. You need to be extremely careful and perform certain technical steps while making sure that you do not commit any error. We have listed out a list of steps that you need to follow while diagnosing the OBD error code P0143.

• Firstly, you will need to check the electrical connections for any shorts or open circuits with the O2 bank 1 sensor 3
• Secondly, you will have to check the exhaust system for any leaks before the O2 sensor that causes excessive oxygen in the exhaust
• Next, attach a diagnostic scanner to see if OBD error code P0143 can be cleared and does not return back. Also, you should check the O2 sensor for the voltage readings to be above .2 volts
• Lastly, you should follow the manufacturer's specific pinpoint tests for further diagnosis

Common Mistakes When Diagnosing The P0143 Code

In order to prevent any misdiagnosis, we recommend you to keep following points in your mind:

Firstly, make sure that you clear the code and conduct a road test under the same conditions found in the freeze frame data. Also, make sure that you check for exhaust leakage or any damages to exhaust manifold or header pipes as if damage they can lead to the issue.