When the Infiniti P0051 Code presents itself, it is an indication that the Air Fuel Ratio (A/F) Sensor 1 (Bank 2) Heater Control Circuit is low. This code often appears when the ECM performs ON/OFF duty control of the A/F sensor 1 heater is out of the normal range. It is important to take the necessary steps to diagnose and rectify the issue quickly. There are several causes that can cause the Infiniti P0051 Code such as a faulty harness or connectors, an open or shorted A/F sensor 1 heater circuit, and a faulty A/F sensor 1 heater. Below is a table that outlines the causes and possible solutions for the Infiniti P0051 Code.
Causes and Solutions for the Infiniti P0051 Code
| Cause | Solution |
|---|---|
| Faulty harness or connectors | Check and replace if necessary |
| Open or shorted A/F sensor 1 heater circuit | Inspect the circuit for any visible damage |
| A/F sensor 1 heater | Replace the A/F sensor 1 heater |
| Related Service Bulletins | Refer to the related service bulletins |
When a vehicle owner notices the Infiniti P0051 Code, it is important to diagnose and fix the issue as soon as possible. This code indicates that the Air Fuel Ratio (A/F) Sensor 1 (Bank 2) Heater Control Circuit is low. Although this code can be caused by many different factors, such as defective harnesses or connectors, open or shorted A/F sensor 1 heater circuit, and a faulty A/F sensor 1 heater, it is important to understand the causes and solutions for the Infiniti P0051 Code. By taking a look at the table outlined in this article, one can identify the cause and solution for the Infiniti P0051 Code and take the necessary steps to correct the issue.
Checking the Harness and Connectors
To start, the first step is to check the harness and connectors for any defect. If the inspection reveals any visible damage, they should be replaced. At this point, it is essential to check the A/F sensor 1 heater circuit for any open or shorted conditions. If the inspection reveals any visible damage, it is important to repair the circuit and then check the operation of the A/F sensor 1 heater.
Replacing the A/F Sensor 1 Heater
If the inspection and repair of the harness and connectors and A/F sensor 1 heater circuit do not resolve the issue, then the A/F sensor 1 heater should be replaced. It is important to refer to the related service bulletins to ensure that the replacement of the A/F sensor 1 heater is successful.
Conclusion
In conclusion, the Infiniti P0051 Code is an indication that the Air Fuel Ratio (A/F) Sensor 1 (Bank 2) Heater Control Circuit is low. By taking a look at the causes and solutions outlined in this article, one can easily identify the solution for the Infiniti P0051 Code and take the necessary steps to correct the issue. It is important to check the harness and connectors for any visible damage, inspect the A/F sensor 1 heater circuit for any open or shorted conditions, and replace the A/F sensor 1 heater if necessary.
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