P1407 Mercedes-Benz 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 Mercedes-Benz 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 Mercedes-Benz 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 Mercedes-Benz?
- 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 Mercedes-Benz?
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 Mercedes-Benz 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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Frequently Asked Questions about P1407 Mercedes-Benz Code
What does the OBDII code P1407 mean on a Mercedes-Benz?
1. P1407 indicates that the Exhaust Gas Recirculation (EGR) flow is out of the expected range during the self-test, suggesting a potential issue with the EGR system. 2.
What are the common symptoms of code P1407 in a Mercedes-Benz?
Symptoms may include a check engine light, rough idling, reduced engine performance, increased emissions, and possible engine knocking or pinging. 3.
What causes the P1407 code to appear on a Mercedes-Benz?
Common causes include a clogged or stuck EGR valve, faulty EGR sensor, carbon buildup in EGR passages, vacuum leaks, or damaged EGR control solenoids. 4.
Can a dirty EGR valve trigger the P1407 code?
Yes, a dirty or clogged EGR valve can restrict exhaust gas flow, leading to the P1407 code. 5.
How can I diagnose the P1407 code on my Mercedes-Benz?
Start by inspecting the EGR valve for carbon buildup, check for vacuum leaks, test the EGR sensor, and verify that the EGR control solenoid is functioning properly. 6.
Is it safe to drive with the P1407 code active?
While the car may still be drivable, prolonged driving can cause engine damage and increased emissions. It's best to address the issue promptly. 7.
Can a faulty EGR sensor cause the P1407 code?
Yes, a malfunctioning EGR sensor can send incorrect data to the ECU, triggering the P1407 code. 8.
How do you fix the P1407 code on a Mercedes-Benz?
Repairs may include cleaning or replacing the EGR valve, clearing carbon deposits from EGR passages, fixing vacuum leaks, or replacing a faulty EGR sensor or solenoid. 9.
Will clearing the P1407 code solve the problem?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning. 10.
Can a vacuum leak cause the P1407 code on a Mercedes-Benz?
Yes, a vacuum leak can disrupt the EGR system's operation, potentially causing the P1407 code.
Discuss the causes and fixes for P1407 Mercedes-Benz OBDII Code
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