AutoCodes – Mercury – P1407 Mercury

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

Quick Answer

The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve. 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 Mercury indicates Exhaust Gas Recirculation Flow Out Of Self-Test Range.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve.
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.

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Code Popularity 1,786

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1407 Mercury Description

The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies from zero with a cold engine to a fixed rate for a hot engine with intermediate load and low engine speed.
This test is performed during the Key On Engine Running (KOER) on demand self-test only. The EGR system is commanded ON at a fixed engine speed. The test fails and the Diagnostic Trouble Code (DTC) is output when the measured EGR flow falls above or below the required calibration.

OBDII Code P1407 Mercury - Exhaust Gas Recirculation Flow Out Of Self-Test Range - AutoCodes.com — P1407 Mercury Code - Exhaust Gas Recirculation Flow Out Of Self-Test Range

What does this mean?

What are the Possible Causes of the DTC P1407 Mercury?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective
Plugged Exhaust Gas Recirculation (EGR) Valve

How to Fix the DTC P1407 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1407 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Mercury Code

1. What are the common symptoms of OBDII code P1407 on a Mercury?

- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What can cause the OBDII code P1407 on a Mercury?

- The code can be triggered by a faulty Exhaust Gas Recirculation (EGR) valve, a clogged EGR passage, or issues with the EGR system components.

3. How serious is the OBDII code P1407 on a Mercury?

- While the code may not cause immediate harm to the vehicle, it can lead to reduced engine performance and increased emissions if left unresolved.

4. Can a clogged EGR valve be cleaned to fix the P1407 code on a Mercury?

- Yes, in some cases, a clogged EGR valve can be cleaned to resolve the issue. However, if cleaning does not work, the valve may need to be replaced.

5. How can I troubleshoot the OBDII code P1407 on my Mercury?

- To troubleshoot the code, you can visually inspect the EGR system for leaks, test the EGR valve for proper operation, and check for any vacuum hose connections.

6. Is it safe to drive with the OBDII code P1407 illuminated on a Mercury?

- It is generally safe to drive with the code present, but it is recommended to address the issue promptly to prevent potential long-term engine damage.

7. What are the repair options for fixing the OBDII code P1407 on a Mercury?

- Repair options include cleaning or replacing the EGR valve, clearing any blockages in the EGR passages, checking and replacing vacuum hoses, or addressing any electrical issues in the EGR system.

8. Can a DIY enthusiast fix the OBDII code P1407 on a Mercury?

- Depending on the level of expertise, DIY enthusiasts may be able to address the issue by cleaning or replacing the EGR valve and performing basic troubleshooting steps.

9. Will resetting the Check Engine Light make the OBDII code P1407 go away on a Mercury?

- Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the P1407 code is not fixed, the light is likely to come back on.

10. How can I prevent the recurrence of the OBDII code P1407 on my Mercury?

- To prevent the code from reoccurring, it is essential to perform regular maintenance on the EGR system, such as cleaning the EGR valve and ensuring proper functioning of all components.