AutoCodes – Mercedes-Benz – P0414 Mercedes-Benz

P0414 Mercedes-Benz Code - Secondary Air Injection System Switching Valve 'A' Circuit Shorted

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid 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: P0414 Mercedes-Benz indicates Secondary Air Injection System Switching Valve 'A' Circuit Shorted.
Common causes: Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid 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.

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Code Popularity 11,860

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0414 Mercedes-Benz Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0414 Mercedes-Benz - Secondary Air Injection System Switching Valve 'A' Circuit Shorted - AutoCodes.com — P0414 Mercedes-Benz Code - Secondary Air Injection System Switching Valve 'A' Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P0414 Mercedes-Benz?

Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection

How to Fix the DTC P0414 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 P0414 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.

Need more information about the P0414 Mercedes-Benz code?

Need more information on how to fix the P0414 Mercedes-Benz code? Get Access to Factory Service Manuals

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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 P0414 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0414 in a Mercedes-Benz related to the Secondary Air Injection System Switching Valve 'A' Circuit Shorted?

- Common symptoms include the check engine light illuminating, rough engine idling, decreased engine performance, and potentially increased emissions.

2. What are some possible causes of OBDII code P0414 in a Mercedes-Benz?

- The code P0414 can be caused by issues such as a short circuit in the switching valve 'A' circuit, damaged wiring or connectors, a faulty secondary air injection system switching valve, or a defective powertrain control module (PCM).

3. How can I diagnose the OBDII code P0414 in my Mercedes-Benz?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors for damage, testing the secondary air injection system switching valve, and checking the PCM for any issues.

4. Is it safe to continue driving my Mercedes-Benz with OBDII code P0414 present?

- It is generally not recommended to continue driving with this code present, as it can lead to further engine damage and increased emissions. It is best to address the issue promptly.

5. How can I repair OBDII code P0414 in my Mercedes-Benz?

- Repair options may include replacing the secondary air injection system switching valve, repairing or replacing damaged wiring or connectors, and resetting the fault code using an OBDII scanner.

6. Can I reset the OBDII code P0414 in my Mercedes-Benz without making any repairs?

- While you can reset the code temporarily, it is crucial to address the underlying issue causing the fault code to prevent it from reoccurring and potentially causing more significant problems.

7. Are there any maintenance tips to prevent OBDII code P0414 in my Mercedes-Benz?

- Regularly inspecting the secondary air injection system components, ensuring proper maintenance of the vehicle's electrical system, and addressing any issues promptly can help prevent OBDII code P0414 from occurring.

8. How long does it typically take to repair OBDII code P0414 in a Mercedes-Benz?

- The repair time can vary depending on the exact cause of the code and the extent of the repair needed. It can range from a quick fix to more extensive troubleshooting and part replacement.

9. Will OBDII code P0414 cause my Mercedes-Benz to fail an emissions test?

- Yes, if the code is not addressed promptly, it can lead to increased emissions, potentially causing your vehicle to fail an emissions test. It is recommended to address the issue before undergoing an emissions test.

10. Can a DIY enthusiast repair OBDII code P0414 in a Mercedes-Benz?

- Depending on the individual's skills and knowledge, some DIY enthusiasts may be able to address the simpler causes of the code, such as checking and replacing fuses or relays. However, more complex issues may require professional diagnosis and repair.