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Engine-Codes – Generic – P1407

P1407 Code - Exhaust Gas Recirculation Flow Out Of Self-Test Range

Quick Answer

The P1407 code indicates that the exhaust gas recirculation (EGR) flow is out of the self-test range. Common causes include Clogged EGR valve: A common cause of the P1407 code is a clogged EGR valve, which restricts the flow of exhaust gases, Faulty EGR position sensor: The EGR position sensor may fail, leading to inaccurate readings and triggering the code, EGR valve stuck open or closed: If the EGR valve is stuck in the open or closed position, it can disrupt the flow of exhaust gases. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1407 indicates Exhaust Gas Recirculation Flow Out Of Self-Test Range.
Common causes
Common causes include Clogged EGR valve: A common cause of the P1407 code is a clogged EGR valve, which restricts the flow of exhaust gases, Faulty EGR position sensor: The EGR position sensor may fail, leading to inaccurate readings and triggering the code, EGR valve stuck open or closed: If the EGR valve is stuck in the open or closed position, it can disrupt the flow of exhaust gases.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1407 Description

The P1407 code indicates that the exhaust gas recirculation (EGR) flow is out of the self-test range. The EGR system is responsible for reducing emissions by recirculating a portion of the exhaust gases back into the engine's intake manifold. This helps lower the combustion temperature, reducing the formation of harmful nitrogen oxides (NOx) in the exhaust.

OBDII Code P1407 - Exhaust Gas Recirculation Flow Out Of Self-Test Range
P1407 Code - Exhaust Gas Recirculation Flow Out Of Self-Test Range

Common Causes of P1407

  1. Clogged EGR valve: A common cause of the P1407 code is a clogged EGR valve, which restricts the flow of exhaust gases.
  2. Faulty EGR position sensor: The EGR position sensor may fail, leading to inaccurate readings and triggering the code.
  3. EGR valve stuck open or closed: If the EGR valve is stuck in the open or closed position, it can disrupt the flow of exhaust gases.
  4. Vacuum leaks: Leaks in the vacuum lines connected to the EGR system can cause improper operation and trigger the code.
  5. Carbon buildup: Over time, carbon deposits can accumulate in the EGR system, affecting its performance and triggering the code.

Symptoms of P1407

  1. Decreased fuel economy
  2. Rough idling or engine misfires
  3. Engine knocking under load
  4. Check Engine light illuminated
  5. Engine stalling or hesitation

How to Fix P1407

  1. Inspect and clean the EGR valve: Remove the EGR valve and clean it thoroughly to remove any carbon buildup or debris that may be causing the issue.
  2. Check and replace the EGR position sensor: Test the EGR position sensor for proper operation and replace it if necessary.
  3. Inspect and repair vacuum leaks: Check the vacuum lines connected to the EGR system for leaks and repair or replace them as needed.
  4. Test EGR valve operation: Ensure that the EGR valve is opening and closing properly by testing its operation with a vacuum pump or multimeter.
  5. Clear the fault codes: After completing the repairs, clear the fault codes using a diagnostic scanner to reset the Check Engine light and monitor the system for any recurring issues.

Cost to Fix P1407

The cost of repairing a P1407 code can vary depending on the specific cause of the issue. On average, the parts for repairing the EGR system can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for addressing the P1407 code typically falls between $200 and $500. However, it's essential to consider that prices can vary based on the vehicle make and model, the location of the repair shop, and the extent of the repairs needed. Be sure to consult with a trusted mechanic or repair shop to receive a more accurate estimate for your specific situation.

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Code P1407 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1407 Code

1. What are common symptoms of OBDII code P1407?

- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and potential stalling.

2. What could cause OBDII code P1407 to trigger?

- The code may be triggered by issues such as a faulty EGR valve, clogged EGR passages, vacuum leaks, or a malfunctioning EGR sensor.

3. How can I diagnose the cause of OBDII code P1407?

- Diagnosing the issue typically involves inspecting the EGR valve and its components, checking for vacuum leaks, testing the EGR sensor, and verifying the functionality of the EGR system.

4. Can a dirty EGR valve cause OBDII code P1407?

- Yes, a dirty or clogged EGR valve can restrict the flow of exhaust gases, leading to the triggering of code P1407.

5. Is it safe to drive with OBDII code P1407 active?

- It is generally not recommended to drive with this code active, as it can affect the vehicle's performance and emissions. It's best to address the issue promptly.

6. How can I repair OBDII code P1407?

- Repair options may include cleaning or replacing the EGR valve, clearing out any clogged passages, fixing vacuum leaks, or replacing the EGR sensor if needed.

7. Can a failing EGR sensor cause OBDII code P1407?

- Yes, a failing EGR sensor can cause improper EGR flow readings, leading to the triggering of code P1407.

8. Are there any DIY tips for addressing OBDII code P1407?

- DIY tips may include checking for visible signs of EGR system issues, cleaning the EGR valve, and inspecting vacuum lines for leaks before seeking professional help if needed.

9. How important is it to fix OBDII code P1407 promptly?

- It is important to address this code promptly to prevent further damage to the engine, ensure proper emissions control, and maintain optimal vehicle performance.

10. Can resetting the OBDII code P1407 clear the issue permanently?

- Resetting the code may temporarily turn off the Check Engine Light, but if the underlying issue is not fixed, the code is likely to return. It is crucial to diagnose and repair the root cause of the problem.

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