P0403 Mercury Code - Exhaust Gas Recirculation Control Circuit
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems components 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, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection. 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 Mercury indicates Exhaust Gas Recirculation Control Circuit .
- Common causes
- Common causes include Faulty EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection.
- 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 P0403 Mercury Description
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the 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 P0403 Mercury?
- Faulty EGR volume control solenoid valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- EGR temperature sensor and circuit
How to Fix the DTC P0403 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 P0403 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.
Need more information about the P0403 Mercury code?
Need more information on how to fix the P0403 Mercury code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0403 Mercury code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0403 Mercury Code
1. What are common symptoms of OBDII code P0403 in a Mercury vehicle?
- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and an illuminated Check Engine Light.
2. What does the OBDII code P0403 on a Mercury indicate?
- OBDII code P0403 indicates a malfunction in the Exhaust Gas Recirculation (EGR) control circuit.
3. What are some possible causes of OBDII code P0403 in a Mercury?
- Possible causes include a faulty EGR valve, damaged EGR solenoid, wiring issues in the EGR circuit, or a clogged EGR passage.
4. How can I diagnose the source of OBDII code P0403 in my Mercury?
- Diagnosis typically involves checking the EGR valve for proper operation, inspecting the EGR solenoid, testing the wiring for continuity, and ensuring the EGR passage is clear.
5. Can I drive my Mercury with OBDII code P0403 without causing further damage?
- It is not recommended to drive with OBDII code P0403 present, as it can lead to decreased engine performance and potential long-term damage if left unresolved.
6. How can I repair OBDII code P0403 in my Mercury?
- Repair options may include replacing the EGR valve, repairing or replacing the EGR solenoid, fixing any wiring issues, or cleaning out the EGR passage.
7. Are there any DIY tips for resolving OBDII code P0403 in a Mercury?
- DIY tips include checking for loose or damaged wiring, cleaning the EGR valve and passage, and ensuring all EGR components are securely connected.
8. Will resetting the Check Engine Light resolve OBDII code P0403 in my Mercury?
- Resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code P0403.
9. How much does it typically cost to repair OBDII code P0403 in a Mercury at a mechanic?
- Repair costs for OBDII code P0403 can vary depending on the exact cause, but they may range from $150 to $500 at a mechanic.
10. Can OBDII code P0403 in a Mercury cause emissions testing failure?
- Yes, OBDII code P0403 can cause a vehicle to fail emissions testing due to increased emissions and improper EGR system operation.
Discuss the causes and fixes for P0403 Mercury OBDII Code
Code P0403 Mercury comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
