AutoCodes – Mercedes-Benz – P0419 Mercedes-Benz

P0419 Mercedes-Benz Code - Secondary Air Injection System Relay 'B' Circuit Malfunction

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: P0419 Mercedes-Benz indicates Secondary Air Injection System Relay 'B' Circuit Malfunction.
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 4,215

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 P0419 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 P0419 Mercedes-Benz - Secondary Air Injection System Relay 'B' Circuit Malfunction - AutoCodes.com — P0419 Mercedes-Benz Code - Secondary Air Injection System Relay 'B' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0419 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 P0419 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 P0419 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 P0419 Mercedes-Benz code?

Need more information on how to fix the P0419 Mercedes-Benz code? Get Access to Factory Service Manuals

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Get the P0419 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 P0419 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0419 in a Mercedes-Benz related to the Secondary Air Injection System Relay 'B' Circuit Malfunction?

- Common symptoms include engine hesitation, rough idling, reduced engine performance, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0419 in a Mercedes-Benz?

- The code P0419 can be triggered by issues such as a faulty secondary air injection pump relay, damaged wiring or connectors in the relay circuit, or a malfunctioning secondary air injection pump.

3. How can I diagnose the Secondary Air Injection System Relay 'B' Circuit Malfunction in my Mercedes-Benz?

- Diagnosing the issue involves using an OBDII scanner to retrieve the fault code P0419, inspecting the secondary air injection system components, checking the relay and related wiring for continuity, and testing the secondary air injection pump.

4. Can I continue driving my Mercedes-Benz with OBDII code P0419 present?

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

5. Is it possible to reset the Check Engine Light caused by OBDII code P0419 in a Mercedes-Benz?

- Resetting the Check Engine Light without addressing the underlying issue will not solve the problem. It is advised to diagnose and repair the root cause of the code before resetting the light.

6. How can I repair OBDII code P0419 in my Mercedes-Benz?

- Repairing the issue involves replacing the faulty secondary air injection pump relay, repairing any damaged wiring or connectors, or replacing the secondary air injection pump if necessary.

7. Are there any maintenance tips to prevent OBDII code P0419 from occurring in my Mercedes-Benz?

- Regularly inspecting the secondary air injection system components, following the manufacturer's recommended maintenance schedule, and addressing any related issues promptly can help prevent code P0419.

8. Can a DIY enthusiast fix OBDII code P0419 in a Mercedes-Benz?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P0419. However, complex electrical issues may require professional assistance.

9. How much does it typically cost to repair OBDII code P0419 in a Mercedes-Benz?

- The cost of repairs for code P0419 can vary depending on the specific issue, parts needed, and labor rates. It is recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

10. Will repairing OBDII code P0419 improve the performance and fuel efficiency of my Mercedes-Benz?

- Yes, addressing the Secondary Air Injection System Relay 'B' Circuit Malfunction can improve engine performance, fuel efficiency, and overall drivability of the vehicle.