If your Nissan displays the code P1271, it indicates a malfunction in the A/F Sensor-11 (Bank 1 Sensor 1) circuit. This code is triggered when the Powertrain Control Module (PCM) detects the Air Fuel Sensor (AFS1) signal is close to 0.00 volts during the Component Control Module (CCM) test. To diagnose and repair the issue, it is important to understand the common causes of the Nissan code P1271, such as a faulty Air Fuel Sensor (AFS) signal circuit, a shorted Air Fuel Sensor (AFS) signal circuit, a damaged or failed Air Fuel Sensor (AFS), or a failed PCM. Knowing the causes and solutions of the P1271 code can help you get your Nissan running in no time.
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P1271 Code Causes and Solutions
| Cause | Solution |
|---|---|
| The Air Fuel Sensor (AFS) signal circuit is open | Check the AFS sensor wiring harness for any issues, or replace the harness as needed. |
| The Air Fuel Sensor (AFS) signal circuit is shorted to the ground | Repair any open or short circuits or replace the AFS sensor as needed. |
| Air Fuel Sensor (AFS) is damaged or has failed | Replace the AFS sensor as needed. |
| PCM has failed | Replace the PCM as needed. |
Common Causes of Nissan Code P1271
The Nissan Code P1271 is a warning that the Powertrain Control Module (PCM) has detected a malfunction in the A/F Sensor-11 (Bank 1 Sensor 1) circuit. This code is typically triggered when the Air Fuel Sensor (AFS1) signal is close to 0.00 volts. The most common causes of this code include an open or shorted AFS signal circuit, a damaged or failed AFS, or a failed PCM.
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Diagnosing and Repairing the P1271 Code
The first step in diagnosing and repairing the P1271 code is to check the AFS sensor wiring harness for any issues. If there are any open or short circuits, they must be fixed. If the wiring harness is damaged, it should be replaced. If the AFS sensor is damaged or has failed, it should also be replaced. Finally, if the PCM has failed, it should be replaced.
Conclusion
Nissan Code P1271 indicates that the PCM has detected a malfunction in the A/F Sensor-11 (Bank 1 Sensor 1) circuit. The most common causes of this code are an open or shorted AFS signal circuit, a damaged or failed AFS, or a failed PCM. To diagnose and repair this issue, it is important to check the AFS sensor wiring harness and replace any damaged components. You can get your Nissan running quickly with the right diagnosis and repairs.
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