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P0403 1999 Ford F150 Code - Exhaust Gas Recirculation Control Circuit

Quick Answer

The P0403 diagnostic trouble code (DTC) for a 1999 Ford F150 relates to the Exhaust Gas Recirculation (EGR) system's control circuit. Common causes include Faulty EGR valve position sensor, Wiring issues such as a short or open circuit, EGR solenoid malfunction. 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
P0403 1999 Ford F150 indicates Exhaust Gas Recirculation Control Circuit .
Common causes
Common causes include Faulty EGR valve position sensor, Wiring issues such as a short or open circuit, EGR solenoid malfunction.
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 13, 2024
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Code P0403 1999 Ford F150 Description

The P0403 diagnostic trouble code (DTC) for a 1999 Ford F150 relates to the Exhaust Gas Recirculation (EGR) system's control circuit. The EGR system is responsible for reducing nitrogen oxide emissions by recirculating a portion of the exhaust gases back into the engine's intake manifold. The EGR control circuit ensures that the EGR valve opens and closes at the appropriate times to regulate the flow of exhaust gases.

OBDII Code P0403 1999 Ford F150 - Exhaust Gas Recirculation Control Circuit
P0403 1999 Ford F150 Code - Exhaust Gas Recirculation Control Circuit

Common Causes of P0403 1999 Ford F150

  1. Faulty EGR valve position sensor
  2. Wiring issues such as a short or open circuit
  3. EGR solenoid malfunction
  4. Carbon buildup in the EGR system
  5. Vacuum leaks in the EGR system

Symptoms of P0403 1999 Ford F150

  1. Reduced engine power
  2. Rough idling or stalling
  3. Hesitation or surging during acceleration
  4. Increased fuel consumption
  5. Check Engine Light illuminated

How to Fix P0403 1999 Ford F150

  1. Begin by diagnosing the specific cause of the P0403 code using a scan tool to check for any related codes and performing a visual inspection of the EGR system components.
  2. Test the EGR valve position sensor and EGR solenoid for proper operation using a multimeter to check for continuity and voltage.
  3. Inspect the wiring harness for any damage or corrosion, repairing or replacing any faulty wiring as needed.
  4. Clean the EGR valve and passages to remove any carbon buildup that may be obstructing the flow of exhaust gases.
  5. Clear the DTC and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0403 1999 Ford F150

The typical repair costs for addressing a P0403 code on a 1999 Ford F150 can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0403 1999 Ford F150

This test checks the electrical function of the EGRVR solenoid. The test fails when the EGRVR circuit voltage is either too high or too low when compared to the expected voltage range. The EGR system must be enabled for the test to be completed.

When is the Code Detected?

An improper voltage signal is sent to ECM through the valve

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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 P0403 1999 Ford F150 Code

1. What are the common symptoms of an OBDII code P0403 in a 1999 Ford F150?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0403 indicate in a 1999 Ford F150?

- The code P0403 specifically relates to a malfunction in the Exhaust Gas Recirculation (EGR) Control Circuit.

3. What are the possible causes of OBDII code P0403 in a 1999 Ford F150?

- Potential causes of code P0403 include a faulty EGR valve, issues with the EGR position sensor, damaged wiring in the EGR circuit, or a malfunctioning EGR solenoid.

4. How can I diagnose the OBDII code P0403 in a 1999 Ford F150?

- Diagnosing code P0403 involves using an OBDII scanner to retrieve the code, checking the EGR valve and related components for visible damage, and testing the EGR circuit for continuity.

5. Can I continue driving my 1999 Ford F150 with an OBDII code P0403?

- It is not recommended to continue driving with an unresolved P0403 code, as it can lead to further damage to the engine and emissions system.

6. Is it possible to repair an OBDII code P0403 in a 1999 Ford F150 at home?

- Depending on your skill level and access to tools, you may be able to address a P0403 code at home by replacing the EGR valve, sensor, or solenoid, or repairing damaged wiring in the EGR circuit.

7. How much does it typically cost to repair an OBDII code P0403 in a 1999 Ford F150 at a mechanic?

- The cost of repairing a P0403 code can vary depending on the exact cause of the issue, but it may range from $150 to $500 at a mechanic, including parts and labor.

8. Will resetting the check engine light resolve the OBDII code P0403 in a 1999 Ford F150?

- Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0403 code to reappear.

9. Are there any maintenance tips to prevent OBDII code P0403 in a 1999 Ford F150?

- Regularly servicing the EGR system, using high-quality fuel, and maintaining proper engine tune-ups can help prevent issues leading to code P0403.

10. Can a malfunctioning EGR system affect the overall performance of a 1999 Ford F150?

- Yes, a malfunctioning EGR system can negatively impact engine performance, fuel efficiency, and emissions control in a 1999 Ford F150, making it crucial to address code P0403 promptly.

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