By Samuel The P1399 code indicates a problem with the Exhaust Gas Recirculation (EGR) system, potentially leading to increased emissions, lower fuel efficiency, and engine damage if left unchecked.
Symptoms of this issue may include rough idling, decreased fuel efficiency, reduced power, and the check engine light being on.
The problem could be due to a faulty EGR valve, clogged cooler, or electrical problems.
To fix the issue, you'll need an OBD-II scanner, multimeter, and wiring diagrams to diagnose the problem and identify the root cause.
What does this Code Mean
The P1399 Ford code means there's a problem with your vehicle's Exhaust Gas Recirculation (EGR) system.
The EGR system reduces nitrogen oxide emissions by reusing some of the engine's exhaust gas. When it doesn't work right, it can cause increased emissions, lower fuel efficiency, and even engine damage.
The code means the vehicle's computer (PCM) has found an issue with the EGR valve or its connected circuits.
You need to get your vehicle checked and fixed to find and solve the problem.
What are the Symptoms
When your Ford's Exhaust Gas Recirculation system doesn't work right, you'll notice some problems.
Your engine won't perform as well, which can be frustrating and affect your driving.
You might experience:
- Rough Idling: Your engine idles rough or stumbles when you're stopped or in park.
- Decreased Fuel Efficiency: Your fuel efficiency goes down, increasing your fuel costs.
- Reduced Power: Your engine feels less powerful, making it harder to accelerate or climb hills.
- Check Engine Light: The check engine light on your dashboard comes on, indicating a problem with your emissions system.
What are the Causes
Causes of Ford's Exhaust Gas Recirculation system malfunction include:
Faulty or clogged EGR valves, stuck open or closed, which prevent proper flow and recirculation of exhaust gases due to carbon deposits or debris.
Other causes are:
- A clogged or leaking EGR cooler, which prevents proper cooling of exhaust gases.
- A bad EGR temperature sensor, which provides incorrect readings.
- Wiring or electrical issues, which prevent proper communication between the EGR system components.
- Software or calibration issues, which cause the EGR system to malfunction, resulting in the P1399 code.
What Tools are Needed to Diagnose
To diagnose the P1399 code, you need the following tools:
- OBD-II scanner: This retrieves trouble codes and monitors live data.
- Multimeter: This measures voltage and resistance in electrical circuits.
- Scan tool: This accesses advanced diagnostic functions and performs bi-directional controls.
- Wiring diagrams: These help navigate the complex electrical system of your Ford vehicle.
How to fix Step by Step
Step 1: Check the fuel pressure sensor's electrical connector for signs of corrosion or damage. Clean or replace the connector as needed.
Step 2: Use a scan tool to monitor the fuel pressure sensor's voltage signal.
Step 3: If the signal's out of range, replace the fuel pressure sensor itself.
Step 4: Consult your repair manual for specific procedures and specifications for your Ford model.
Step 5: Clear the P1399 code and test the system to ensure the issue's resolved.
What are the Common Diagnosis Mistakes
When fixing the P1399 code, you may encounter setbacks or unexpected twists.
Misinterpreting the code or confusing it with a similar code is a common pitfall.
Common diagnosis mistakes to watch out for include:
- Ignoring other trouble codes: Check for other related codes.
- Failing to check the basics: Start by checking simple things like wiring and connections.
- Relying on guesswork: Use a systematic approach to diagnose the issue, avoiding assumptions.
- Not consulting the repair manual: Consult the repair manual or online resources if you're unsure about a particular step or procedure.
What is the Repair Cost
The repair cost for the P1399 code can range from $500 to $2,000, including parts and labor, depending on the root cause of the issue.
Can I drive safely with this code?
You can still drive with a P1399 code, but it's not recommended.
The faulty EGR system can cause reduced power, poor fuel efficiency, and engine knocking. Continuing to drive can lead to more severe engine damage or even failure.
Get your Ford checked and repaired by a mechanic as soon as possible.