AutoCodes – Ford – P1408 1997 Ford F150

P1408 1997 Ford F150 Code - EGR Flow Out Of Self-Test Range

Quick Answer

The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve. 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: P1408 1997 Ford F150 indicates EGR Flow Out Of Self-Test Range.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective, Plugged Exhaust Gas Recirculation (EGR) Valve.
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 5,077

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 Nov 30, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P1408 1997 Ford F150 Description

The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies from zero with a cold engine to a fixed rate for a hot engine with intermediate load and low engine speed.
This test is performed during the Key On Engine Running (KOER) on demand self-test only. The EGR system is commanded ON at a fixed engine speed. The test fails and the Diagnostic Trouble Code (DTC) is output when the measured EGR flow falls above or below the required calibration.

OBDII Code P1408 1997 Ford F150 - EGR Flow Out Of Self-Test Range - AutoCodes.com — P1408 1997 Ford F150 Code - EGR Flow Out Of Self-Test Range

What does this mean?

What are the Possible Causes of the DTC P1408 1997 Ford F150?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective
Plugged Exhaust Gas Recirculation (EGR) Valve

How to Fix the DTC P1408 1997 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 does this mean?

Code Tech Notes

Replace an EGR Valve 1997 Ford F150

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1408 1997 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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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 P1408 1997 Ford F150 Code

1. What does the OBDII code P1408 mean on a 1997 Ford F150?

P1408 indicates that the EGR (Exhaust Gas Recirculation) flow is out of the expected range during a self-test, suggesting a problem with the EGR system.

2. What are the common symptoms of code P1408 on a 1997 Ford F150?

Symptoms may include poor engine performance, rough idle, reduced fuel economy, increased emissions, or the Check Engine Light being illuminated.

3. What causes the P1408 code to appear on a 1997 Ford F150?

Common causes include a faulty EGR valve, clogged EGR passages, a malfunctioning DPFE (Differential Pressure Feedback EGR) sensor, or issues with the vacuum lines or control solenoid.

4. How do I diagnose the P1408 code on my 1997 Ford F150?

Check the EGR valve, DPFE sensor, vacuum hoses, and passages for clogs or damage. Use a scan tool to monitor EGR system operation and compare readings to specifications.

5. Can a dirty EGR valve cause the P1408 code on a 1997 Ford F150?

Yes, carbon buildup in the EGR valve or passages can restrict flow and trigger the P1408 code.

6. How do I fix the P1408 code on my 1997 Ford F150?

Cleaning the EGR valve and passages, replacing a faulty DPFE sensor, or repairing damaged vacuum lines are common fixes. In some cases, the EGR valve itself may need replacement.

7. Will driving with the P1408 code harm my 1997 Ford F150?

Driving with this code can lead to poor performance, increased emissions, and potential damage to the catalytic converter over time. Itâ€™s best to address it promptly.

8. How much does it cost to repair the P1408 code on a 1997 Ford F150?

The cost depends on the exact issue, but cleaning the EGR valve may cost $50-$100, while replacing the DPFE sensor or EGR valve can cost $100-$300, including parts and labor.

9. Can a faulty DPFE sensor trigger the P1408 code on a 1997 Ford F150?

Yes, a malfunctioning DPFE sensor can provide incorrect readings to the ECU, resulting in the P1408 code being triggered.

10. How can I prevent the P1408 code from recurring on my 1997 Ford F150?

Regular maintenance, such as cleaning the EGR system and inspecting vacuum lines, can help prevent carbon buildup and keep the system functioning properly.