AutoCodes – Mercedes-Benz – P0416 Mercedes-Benz

P0416 Mercedes-Benz Code - Secondary Air Injection System Switching Valve 'B' Circuit Open

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: P0416 Mercedes-Benz indicates Secondary Air Injection System Switching Valve 'B' Circuit Open.
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 5,340

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 Apr 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0416 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 P0416 Mercedes-Benz - Secondary Air Injection System Switching Valve 'B' Circuit Open - AutoCodes.com — P0416 Mercedes-Benz Code - Secondary Air Injection System Switching Valve 'B' Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0416 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 P0416 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 P0416 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 P0416 Mercedes-Benz code?

Need more information on how to fix the P0416 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 P0416 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0416 in a Mercedes-Benz related to the Secondary Air Injection System Switching Valve 'B' Circuit Open?

- Common symptoms include rough engine idle, decreased engine performance, illuminated Check Engine Light, and potentially increased emissions.

2. What are the possible causes triggering the OBDII code P0416 in a Mercedes-Benz?

- The code P0416 can be triggered by a faulty Secondary Air Injection System Switching Valve 'B', damaged wiring or connectors in the circuit, or a problem with the PCM (Powertrain Control Module).

3. How can I diagnose the OBDII code P0416 in my Mercedes-Benz?

- Diagnosis involves using an OBDII scanner to retrieve the code, visually inspecting the switching valve and related components, and testing the circuit for continuity and proper voltage.

4. Can I continue driving my Mercedes-Benz with the OBDII code P0416 present?

- It is not recommended to drive with the code P0416 present as it can lead to further damage to the engine and emission control system. It is advised to address the issue promptly.

5. What are the repair options for fixing the Secondary Air Injection System Switching Valve 'B' Circuit Open in a Mercedes-Benz?

- Repair options include replacing the faulty switching valve, repairing damaged wiring or connectors in the circuit, or reprogramming the PCM if needed.

6. Are there any DIY tips for resolving the OBDII code P0416 in a Mercedes-Benz?

- DIY tips include checking for loose or damaged wiring, ensuring proper connections to the switching valve, and clearing the code with an OBDII scanner to see if it returns.

7. How much does it typically cost to repair the OBDII code P0416 in a Mercedes-Benz at a professional repair shop?

- The cost of repair can vary depending on the exact cause of the issue, but it can range from $200 to $500 for parts and labor.

8. Can a faulty Secondary Air Injection System Switching Valve 'B' affect the overall performance of my Mercedes-Benz?

- Yes, a faulty switching valve can affect the engine's performance, fuel efficiency, and emissions, leading to potential issues such as rough idle and decreased power.

9. Is the OBDII code P0416 in a Mercedes-Benz a common issue among owners?

- While not the most common OBDII code, P0416 can occur in Mercedes-Benz vehicles, especially in older models or those with high mileage.

10. How often should I have the Secondary Air Injection System in my Mercedes-Benz inspected to prevent the occurrence of the OBDII code P0416?

- It is recommended to have the Secondary Air Injection System inspected during routine maintenance services or whenever you notice any symptoms related to its operation to prevent issues like the OBDII code P0416.