P0406 1999 Ford F150 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 1999 Ford F150 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.
Code P0406 1999 Ford F150 Description
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.
What are the Possible Causes of the DTC P0406 1999 Ford F150?
- 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 1999 Ford F150?
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 1999 Ford F150 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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Frequently Asked Questions about P0406 1999 Ford F150 Code
1. What are the common symptoms of OBDII code P0406 in a 1999 Ford F150?
The common symptoms include rough idle, engine hesitation, decreased fuel efficiency, and the illumination of the check engine light.
2. What does the OBDII code P0406 'Exhaust Gas Recirculation Sensor A Circuit High' indicate in a 1999 Ford F150?
This code indicates that the exhaust gas recirculation (EGR) sensor 'A' circuit is detecting a high voltage signal, which can affect the proper functioning of the EGR system.
3. What are the possible causes of OBDII code P0406 in a 1999 Ford F150?
Possible causes include a faulty EGR sensor, damaged wiring or connectors in the EGR circuit, carbon buildup in the EGR system, or issues with the engine control module (ECM).
4. How can I diagnose the OBDII code P0406 in my 1999 Ford F150?
You can diagnose the code by inspecting the EGR system components, checking the wiring and connectors for damage, testing the EGR sensor, and using a scan tool to monitor EGR system data.
5. Can I drive my 1999 Ford F150 with OBDII code P0406?
It is not recommended to drive with this code for an extended period as it can lead to poor engine performance and potential damage. It's best to address the issue promptly.
6. How can I repair OBDII code P0406 in my 1999 Ford F150?
Repair options include replacing the faulty EGR sensor, repairing damaged wiring or connectors, cleaning carbon buildup in the EGR system, and resetting the ECM after repairs.
7. Are there any DIY tips for fixing OBDII code P0406 in a 1999 Ford F150?
While some basic troubleshooting like checking for loose connections can be done DIY, it's recommended to have a professional diagnose and repair the issue to ensure proper resolution.
8. How much does it typically cost to fix OBDII code P0406 in a 1999 Ford F150?
The cost can vary depending on the specific cause of the code and labor rates in your area. Repairs for this code can range from $100 to $500 or more.
9. Can OBDII code P0406 in a 1999 Ford F150 cause damage to the engine?
Continued driving with this code can lead to reduced engine performance, increased emissions, and potential damage to components like the catalytic converter. It's best to address the issue promptly.
10. How often does OBDII code P0406 occur in a 1999 Ford F150?
While the frequency can vary, this code is relatively common in vehicles with EGR systems, particularly in older models like the 1999 Ford F150. Regular maintenance can help prevent recurrence.
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