P1407 Code - Exhaust Gas Recirculation 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
- P1407 indicates Exhaust Gas Recirculation 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.
Code P1407 Description
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.
What are the Possible Causes of the DTC P1407?
- 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 P1407?
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 P1407 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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Information for Specific Makes
- P1407 Audi — EGR Temperature Sensor Signal Too Low
- P1407 BMW — Tank Fill Level Right Signal
- P1407 Buick — Exhaust Gas Recirculation Control Circuit Shorted
- P1407 Cadillac — Exhaust Gas Recirculation Control Circuit Shorted
- P1407 Chevrolet — Exhaust Gas Recirculation Control Circuit Shorted
- P1407 Ford — Exhaust Gas Recirculation Flow Out Of Self-Test Range
- P1407 GMC — Exhaust Gas Recirculation Control Circuit Shorted
- P1407 Lincoln — Exhaust Gas Recirculation Flow Out Of Self-Test Range
- P1407 Mazda — EGR No Flow Detected
- P1407 Mercedes-Benz — Exhaust Gas Recirculation Flow Out Of Self-Test Range
- P1407 Mercury — Exhaust Gas Recirculation Flow Out Of Self-Test Range
- P1407 Volkswagen — EGR Temperature Sensor Signal Too Low
Frequently Asked Questions about P1407 Code
1. What are common symptoms of OBDII code P1407?
- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and potential stalling.
2. What could cause OBDII code P1407 to trigger?
- The code may be triggered by issues such as a faulty EGR valve, clogged EGR passages, vacuum leaks, or a malfunctioning EGR sensor.
3. How can I diagnose the cause of OBDII code P1407?
- Diagnosing the issue typically involves inspecting the EGR valve and its components, checking for vacuum leaks, testing the EGR sensor, and verifying the functionality of the EGR system.
4. Can a dirty EGR valve cause OBDII code P1407?
- Yes, a dirty or clogged EGR valve can restrict the flow of exhaust gases, leading to the triggering of code P1407.
5. Is it safe to drive with OBDII code P1407 active?
- It is generally not recommended to drive with this code active, as it can affect the vehicle's performance and emissions. It's best to address the issue promptly.
6. How can I repair OBDII code P1407?
- Repair options may include cleaning or replacing the EGR valve, clearing out any clogged passages, fixing vacuum leaks, or replacing the EGR sensor if needed.
7. Can a failing EGR sensor cause OBDII code P1407?
- Yes, a failing EGR sensor can cause improper EGR flow readings, leading to the triggering of code P1407.
8. Are there any DIY tips for addressing OBDII code P1407?
- DIY tips may include checking for visible signs of EGR system issues, cleaning the EGR valve, and inspecting vacuum lines for leaks before seeking professional help if needed.
9. How important is it to fix OBDII code P1407 promptly?
- It is important to address this code promptly to prevent further damage to the engine, ensure proper emissions control, and maintain optimal vehicle performance.
10. Can resetting the OBDII code P1407 clear the issue permanently?
- Resetting the code may temporarily turn off the Check Engine Light, but if the underlying issue is not fixed, the code is likely to return. It is crucial to diagnose and repair the root cause of the problem.
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