AutoCodes – Lincoln – P0406 Lincoln

P0406 Lincoln Code - Exhaust Gas Recirculation Sensor 'A' Circuit High

Quick Answer

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted. 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: P0406 Lincoln indicates Exhaust Gas Recirculation Sensor 'A' Circuit High.
Common causes: Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted.
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 3,595

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 Apr 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0406 Lincoln Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

OBDII Code P0406 Lincoln - Exhaust Gas Recirculation Sensor 'A' Circuit High - AutoCodes.com — P0406 Lincoln Code - Exhaust Gas Recirculation Sensor 'A' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0406 Lincoln?

Faulty EGR volume control solenoid valve
Carbon built up on EGR valve
EGR volume control solenoid valve harness is open or shorted
EGR volume control solenoid valve circuit poor electrical connection
Faulty EGR temperature sensor and circuit

How to Fix the DTC P0406 Lincoln?

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 P0406 Lincoln 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 P0406 Lincoln Code

1. What are common symptoms of the OBDII code P0406 in a Lincoln?

The common symptoms of P0406 in a Lincoln may include rough idling, decreased fuel efficiency, engine stalling, and the illumination of the Check Engine light.

2. What does the OBDII code P0406 Lincoln indicate?

The OBDII code P0406 in a Lincoln indicates a problem with the Exhaust Gas Recirculation (EGR) Sensor 'A' Circuit registering a high voltage.

3. What are possible causes of the P0406 code in a Lincoln?

Possible causes of the P0406 code in a Lincoln include a faulty EGR sensor, a damaged EGR valve, wiring issues in the EGR system, or a clogged EGR passage.

4. How can I diagnose the P0406 code in my Lincoln?

Diagnosing the P0406 code in a Lincoln involves using an OBDII scanner to read the code, checking the EGR sensor and valve for proper function, inspecting the wiring for any damage, and ensuring the EGR passages are clear.

5. Can I drive my Lincoln with the P0406 code?

It is not recommended to drive your Lincoln with the P0406 code present, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair the P0406 code in my Lincoln?

To repair the P0406 code in a Lincoln, you may need to replace the EGR sensor or valve, repair any damaged wiring, clean out the EGR passages, and reset the Check Engine light.

7. Will resetting the Check Engine light fix the P0406 code in my Lincoln?

Resetting the Check Engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0406 code in your Lincoln.

8. Can a DIY enthusiast fix the P0406 code in a Lincoln?

Depending on your automotive repair skills, a DIY enthusiast may be able to diagnose and repair the P0406 code in a Lincoln, especially if it involves tasks like sensor or valve replacement.

9. How much does it cost to repair the P0406 code in a Lincoln?

The cost of repairing the P0406 code in a Lincoln can vary depending on the specific issue causing the code, but it may range from $100 to $500 for parts and labor.

10. How often does the P0406 code occur in Lincoln vehicles?

The P0406 code can occur in Lincoln vehicles, particularly in older models or those with high mileage, due to wear and tear on the EGR components. Regular maintenance can help prevent this issue.