P1403: DPFE Sensor Hoses Reversed

Definition

The OBD2 code P1403 indicates that the Differential Pressure Feedback EGR (DPFE) sensor hoses are reversed, which can lead to incorrect readings and affect the vehicle's exhaust gas recirculation system

Common causes

Incorrect installation of DPFE sensor hoses
Damaged or worn hoses
Blocked or restricted hoses
Faulty DPFE sensor
Vacuum leaks in the system

Common misdiagnoses

Faulty DPFE sensor
Exhaust gas recirculation (EGR) valve issues
Vacuum leaks
Faulty EGR system components
Wiring or connector problems
Engine performance issues unrelated to EGR system
Faulty engine control module (ECM)

Troubleshooting steps

1. Visual Inspection
2. Check the DPFE sensor and its hoses for any signs of damage, wear, or disconnection
3. Ensure that the hoses are connected to the correct ports on the DPFE sensor. The DPFE sensor typically has two hoses: one connected to the EGR tube and the other to the intake manifold
4. Verify Hose Connections
5. Confirm that the hoses are not reversed. The hose from the EGR tube should connect to the port that measures the pressure from the EGR system, while the hose from the intake manifold should connect to the port that measures the atmospheric pressure
6. Check for Blockages
7. Inspect the hoses for any blockages or restrictions. A clogged hose can lead to incorrect pressure readings
8. Check the EGR valve and passages for carbon buildup or blockages that could affect the EGR system's operation
9. Test the DPFE Sensor
10. Use a multimeter to test the DPFE sensor's voltage and resistance according to the manufacturer's specifications. If the readings are outside the specified range, the sensor may be faulty and need replacement
11. Inspect Electrical Connections
12. Check the electrical connectors to the DPFE sensor for corrosion, damage, or loose connections. Clean or repair as necessary
13. Clear the Code
14. After making any repairs or adjustments, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
15. Check for Other Codes
16. Look for any other related trouble codes that may indicate additional issues with the EGR system or other components
17. Consult Repair Manual
18. Refer to the vehicle's service manual for specific troubleshooting procedures and specifications related to the DPFE sensor and EGR system
19. Professional Diagnosis
20. If the issue persists after performing the above steps, consider seeking help from a professional mechanic who can perform a more in-depth diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P1403 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Visual Inspection

2. Check the DPFE sensor and its hoses for any signs of damage, wear, or disconnection

3. Ensure that the hoses are connected to the correct ports on the DPFE sensor. The DPFE sensor typically has two hoses: one connected to the EGR tube and the other to the intake manifold

4. Verify Hose Connections

5. Confirm that the hoses are not reversed. The hose from the EGR tube should connect to the port that measures the pressure from the EGR system, while the hose from the intake manifold should connect to the port that measures the atmospheric pressure

6. Check for Blockages

7. Inspect the hoses for any blockages or restrictions. A clogged hose can lead to incorrect pressure readings

8. Check the EGR valve and passages for carbon buildup or blockages that could affect the EGR system's operation

9. Test the DPFE Sensor

10. Use a multimeter to test the DPFE sensor's voltage and resistance according to the manufacturer's specifications. If the readings are outside the specified range, the sensor may be faulty and need replacement

11. Inspect Electrical Connections

12. Check the electrical connectors to the DPFE sensor for corrosion, damage, or loose connections. Clean or repair as necessary

13. Clear the Code

14. After making any repairs or adjustments, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

15. Check for Other Codes

16. Look for any other related trouble codes that may indicate additional issues with the EGR system or other components

17. Consult Repair Manual

18. Refer to the vehicle's service manual for specific troubleshooting procedures and specifications related to the DPFE sensor and EGR system

19. Professional Diagnosis

20. If the issue persists after performing the above steps, consider seeking help from a professional mechanic who can perform a more in-depth diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P1403 code