P0426 OBD Error Code: Problem & Solutions

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The trouble code P0426 can be defined as Catalyst Temperature Sensor Range/Performance (Bank 1). This fault code is related to one of the vehicle’s catalytic converter. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

One of the most important pieces of emissions equipment on a vehicle is the catalytic converter. There are some exhaust gases which would pass through the catalytic converter which would then give rise to a chemical reaction. When this reaction has taken place, it would convert carbon monoxide, nitrogen oxides and hydrocarbon into harmless water as well as carbon dioxide.

This fault code would start appearing if there is some issue with the vehicle bank 1 catalytic converter. It is a part of the exhaust and its main function is to reduce the emissions for either the entire engine or only the bank of cylinders which includes cylinder one.

What causes this problem with the Catalyst Temperature Sensor Range/Performance (Bank 1)?

• Poor quality gas
• Defaults in the oxygen sensor
• Catalyst Temperature Sensor circuit might have bad electrical connection
• The PCM/PCM programming might be quirky
• The catalyst temperature sensor might have some defects
• Problems related to wiring
• The exhaust air/fuel mixture can be out of balance
• There can be opened or shorted catalyst temperature sensor harness
• Leakage in the exhaust

1. Diagnostic Tool - Do you want to buy new Car Diagnostic Tools? You can always rely on us as we have best Automotive Diagnostic Tools for our customers.
2. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A damaged Powertrain Control Module can cause a lot of issues like displaying P0426 code.
3. Exhaust System Parts - Exhaust System Parts should never be neglected. May be there is some fault in them due to which P0426 code may start flashing.
4. Catalytic Converter - Is your Catalytic Converter damaged or broken? Don’t worry as we have solutions for all your problems.
5. Oxygen Sensor - Defective car Oxygen Sensor can be a major reason why P0426 code depicts. So, make sure to replace it with new Denso Oxygen Sensor online so that you don’t have to face any further issues.
6. Air Fuel Ratio Sensor - Everything is okay with the Engine Control Module and still OBD code P0426 triggering? Then there must be some defects in Air Fuel Ratio Sensor. Replace them as soon as possible.
7. Engine Control Module - Engine Control Module is an important auto part. Take care of it and you can rely on us to purchase best quality Engine Control Module online.

Willing to know some common symptoms of OBD Trouble Code P0426? Your wish is our demand. Have a look at them below:

Common Symptoms

• The emissions can start rising
• There can be poor engine performance
• Illumination in the check engine light
• Decrease in the overall fuel economy

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0426:

• The defective wiring should be repaired or replaced properly
• A lot of problems can be caused due to programming error in the PCM, so you can always replace it
• Restore the quirky catalyst temperature sensor
• Inspect the electrical connection in the catalyst temperature sensor circuit

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• The car mechanic should visually inspect the catalytic converter and the oxygen sensors to ensure they seem to be in good condition and to rule out one or the other as a cause.
• A faulty catalytic converter will usually give itself away from an audible rattle when hit with a small hammer. If the oxygen sensor wiring appears damaged, the entire sensor may need to be replaced.
  
• If the trouble code is present with no noticeable symptoms, the P0426 may be an intermittent code that could be dealt with by simply resetting the engine computer.
  

Common Mistakes When Diagnosing The P0426 Code

• Catalytic converter temperature sensor might start failing
• Quirks in the powertrain control module
• Problems related to wiring