Interpreting P1406 Ford Engine Code: A Comprehensive Guide to Diagnosing and Resolving Issues

Diagnosing a Check Engine Light with an Auto Scanner

When the check engine light comes on, it can be a cause for concern. However, having an auto scanner can help you diagnose the issue efficiently. In the following blog post, we will take a closer look at using an auto scanner to address a particular check engine code.

Identifying the Issue

By using an auto scanner, you can plug it into your vehicle and retrieve the error code. In this instance, the code obtained was ‘DP Fe downstream hose off.’ This indicates that the hose may be disconnected from the differential pressure feedback sensor, clogged up, or the sensor might be failing.

Inspecting Under the Hood

Upon inspecting under the hood, the differential pressure feedback sensor and its connected hoses were found. The existing hoses were in poor condition, in addition to being clogged up with debris. This was a significant find, as the hoses had never been replaced in 18 years.

Resolving the Issue

After identifying the faulty hoses, they were promptly replaced with new ones, effectively resolving the issue. In some cases, if the hoses are in good condition, cleaning them out may also rectify the problem. However, if the issue persists, it may be necessary to replace the differential pressure feedback sensor.

Clearing the Code

Once the issue was addressed, the next step was to clear the error code using the auto scanner. After clearing the code, the vehicle was tested, and it ran without any issues.


Having an auto scanner proved to be invaluable in diagnosing and resolving the check engine code. This experience also highlighted the importance of checking the condition of hoses and sensors before seeking professional assistance. By utilizing an auto scanner and following the necessary steps, it is possible to address certain issues independently, potentially saving time and money.

So, if you encounter a similar check engine code, consider using an auto scanner and following the steps outlined here before contacting a mechanic. With the right tools and knowledge, you may be able to resolve the issue on your own.

What does it mean if the check engine light comes on?

If the check engine light comes on, it is a good idea to have an auto scanner to plug in and see what code you get. The code will help diagnose the issue.

What should I do if I get the error code P1406 on a Ford F-150?

The error code P1406 on a Ford F-150 could indicate an issue with the Differential Pressure Feedback (DPFE) sensor. It is recommended to check the hoses connected to the sensor, as they may be disconnected or clogged. If the hoses are in good shape, blowing them out with pressure may help. If the issue persists, replacing the DPFE sensor may be necessary.

How do I clear the error code on a Ford F-150?

To clear the error code on a Ford F-150, use an auto scanner to go to the main menu, then select ‘erase codes’ and confirm the action. Start the vehicle and drive it a little bit to ensure the issue has been resolved.

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