AutoCodes – Mercedes-Benz – P0411 Mercedes-Benz

P0411 Mercedes-Benz Code - Secondary Air Injection System Incorrect Flow Detected

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Vacuum hoses damaged, Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted. 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: P0411 Mercedes-Benz indicates Secondary Air Injection System Incorrect Flow Detected.
Common causes: Common causes include Faulty Vacuum hoses damaged, Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted.
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 10,840

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 P0411 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 P0411 Mercedes-Benz - Secondary Air Injection System Incorrect Flow Detected - AutoCodes.com — P0411 Mercedes-Benz Code - Secondary Air Injection System Incorrect Flow Detected

What does this mean?

What are the Possible Causes of the DTC P0411 Mercedes-Benz?

Faulty Vacuum hoses damaged
Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection
Air bypass solenoid leaking/blocked or stuck open/closed
Air diverter valve leaking/blocked or stuck open/closed

How to Fix the DTC P0411 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 P0411 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 P0411 Mercedes-Benz code?

Need more information on how to fix the P0411 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0411 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0411 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0411 in a Mercedes-Benz?

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

2. What does the OBDII code P0411 indicate in a Mercedes-Benz?

- The code indicates that there is an incorrect flow detected in the secondary air injection system of the vehicle.

3. What are the possible causes of OBDII code P0411 in a Mercedes-Benz?

- Potential causes include a faulty secondary air injection pump, damaged or clogged air injection hoses, a malfunctioning air injection system relay, or issues with the air injection valves.

4. How can I diagnose the OBDII code P0411 in my Mercedes-Benz?

- Diagnosis typically involves checking the secondary air injection system components for any visible damage or blockages, testing the pump and related components for proper operation, and using a scan tool to gather data from the vehicle's onboard computer.

5. Can I continue driving my Mercedes-Benz with OBDII code P0411?

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

6. How can I repair OBDII code P0411 in my Mercedes-Benz?

- Repair typically involves replacing any faulty components in the secondary air injection system, such as the pump, hoses, relay, or valves. Proper diagnostics are crucial to pinpointing the exact cause of the issue.

7. Is it possible to clear the OBDII code P0411 in my Mercedes-Benz without repairing the issue?

- Clearing the code without addressing the underlying problem will only temporarily turn off the check engine light. The issue will likely resurface, so it is important to diagnose and repair the root cause.

8. Can a DIY enthusiast fix OBDII code P0411 in a Mercedes-Benz?

- While some components may be accessible for DIY repair, diagnosing and repairing the secondary air injection system can be complex. It is often best to consult a professional mechanic with experience in Mercedes-Benz vehicles.

9. How much does it typically cost to repair OBDII code P0411 in a Mercedes-Benz?

- The cost of repair can vary depending on the specific cause of the code and labor rates in your area. Replacement parts and labor for diagnosing and fixing the issue can range from a few hundred to over a thousand dollars.

10. How can I prevent OBDII code P0411 from recurring in my Mercedes-Benz?

- Regular maintenance and inspections of the secondary air injection system, including checking for debris or blockages, can help prevent the code from recurring. Additionally, addressing any issues promptly can prevent further damage.