P0159 OBD Error Code: Problem & Solutions

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The P0159 trouble code can be defined as O2 sensor circuit slow response bank 2 sensor 2. Has your car mechanic told that there are some faults in the rear heated oxygen sensor bank 2? Or the issue of inappropriate fuel pressure? Then there are chances that P0159 fault code is soon going to appear.

The P0159 is a generic code which indicates a specific sensor in the exhaust system bank 2 sensor 2 is not performing as per the mark. Now when the oxygen sensor would modulate slowly, it is an indication that it is bad. The catalyst efficiency can be monitored by the car sensor for emissions purposes.

What causes this problem with the 02 Sensor Circuit Slow Response (Bank 2 Sensor 2)?

• There can be some faults in the rear heated oxygen sensor bank 2
• The rear heated oxygen sensor bank 2 harness might be opened or shorted
• Bad electrical connection in the rear heated oxygen sensor bank 2
• There can be inappropriate fuel pressure
• The fuel injectors can be defective
• Some faults in the intake air leaks
• Leakage in the exhaust gas

1. Oxygen Sensor - Defective car Oxygen Sensor can be a major reason why P0159 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
2. Exhaust Parts - Everything is okay with the oxygen sensor and still OBD code P0159 triggering? Then there must be some defects in Exhaust Parts. Replace them as soon as possible.
3. Powertrain Control Module - P0159 code flashing? Get your Powertrain Control Module inspected from a mechanic.
4. Diagnostic Tools - Willing to buy some new diagnostic tools? Visit us and solve your problem.

Willing to know some common symptoms of OBD Code P0159? Your wish is our demand. Have a look at them below:

Common Symptoms

• The service engine soon warning light can start appearing
• There can be an increase in the fuel consumption
• Excessive smoke can start coming out from the exhaust
• There can be an overall decrease in the engine performance

We have listed out some ways which would help you to correct the occurrence of OBD Code P0159. They are mentioned here as follows:

• The most common way or repairing is the replacement of the indicated oxygen sensor (bank 2 sensor 2)
• If there are any leaks in the exhaust, then they must be repaired before any oxygen sensor is replaced
• It is not uncommon to find damaged wiring in the oxygen sensor circuit that would need to be repaired. These circuits are shielded and require extra attention when fixing them

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• First of all, you must check Technical Service Bulletins for problems specific to individual year make and model vehicles
• This code is then set by the computer after performing some very specific tests. For this reason, a technician having scanned the vehicle and finding this code will likely confirm there aren’t any exhaust leaks before replacing the indicated sensor
• There are a variety of methods with which extensive tests can be performed. A technician can tap directly into the oxygen sensors circuit and observe its function with an oscilloscope. This is usually performed while introducing propane into the intake or creating a vacuum leak and observing how the oxygen sensor reacts to the change in conditions. Always make sure that you take your vehicle out for a test drive
• Perform the resistance tests with the oxygen sensors connector unplugged from the vehicle's electrical harness. At times, this is done while applying heat to the sensor simulating conditions the sensor would experience when installed in the exhaust system

Common Mistakes When Diagnosing The P0159 Code

• Most of the people fail to spot other problems, such as exhaust leaks, vacuum leaks, or misfires are not uncommon. Sometimes other problems can be subtle and easy to miss
• Downstream O2 sensors (O2 sensors after the catalytic converter) exist to make sure the vehicle meets the EPA’s tailpipe emissions standards. Not only does this O2 sensor test the catalyst efficiency, the effectiveness of the sensor is checked by performing these tests
• The stringent nature of these tests requires all other systems to be operating correctly or the results may not be accurate
• Make sure that the other codes and symptoms are addressed first