Error Code P0419: What It Means & What To Do?

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Are you experiencing rough idles with engine stalling and not starting on many occasions? Is the Check Engine Light illuminated and you notice increased emissions? All this can be an indication of problem with the air injection system and thus can store and flash P0419 error in the Powertrain Control Module (PCM).

Fluctuations in secondary air injection system pressure gets monitored by the PCM using voltage input signals from pressure sensors. When the pressure falls below a certain degree, the PCM electronically opens the necessary valves and allows secondary air to be pumped into the exhaust system. Engine temperature, RPMs, and vehicle speed are also considered in air pump activation. In vehicles that are equipped with electric pumps, the PCM monitors SAI pressure sensors and activates the pump when required. The system relay serves to transfer battery voltage from the fuse panel or fusible link to the SAI pump. If the PCM detects a voltage input signal from the relay (named as B) circuit that indicates a malfunction has occurred, a code P0419 will be stored and a malfunction indicator lamp may be illuminated.

What causes this problem with the Secondary Air Injection System Relay "B" Circuit Malfunction?

• Clogged or disconnected vacuum hose
• Powertrain Control Module (PCM) failure
• Secondary air pump control valve failure
• Secondary air pump failure
• Secondary air pump relay failure
• Wiring issue

1. Air Injection Pump - If the air pump is faulty, it will affect engine performance and thus needs immediate replacement. Buy new air pump now.
2. Air Control Valve Relay - Relay “B” malfunction is the main reason for OBD code P0419 error and will require immediate replacement. Buy new valve relay now!
3. Air Injection Check Valve - Faulty check valves can cause moisture to enter the system and hamper the performance and increasing emissions. Replace it now!
4. Diagnostic Tools - Experienced mechanic will require quality diagnostic tools to resolve OBD code errors. Buy new tools from us!
5. Exhaust Manifold - Check for exhaust manifold problems and repair or replace as needed.
6. Air Injection System - Any problem with the air injection system has to be corrected and thus may require immediate replacements. Buy air intake components from us.

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P0419

Common Symptoms

• Check Engine Light illumination
• Loss of acceleration
• Engine stalling and rough idles
• Increased emissions
• Reduced performance

To correct this issue, you might need to undergo few replacements for the defective parts such as: Replacement of one-way check valves if they do not work properly.

• Replacement of any damaged or faulty wiring or connectors.
• Replacement of any damaged or cracked fittings or hoses on the secondary air injection system.
• Replacement of any blown fuses associated with the secondary air injection system, looking for recurrence of the fuses blowing upon testing.
• Replacement of the secondary air injection pump if further diagnosis determines it to be at fault.

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of Air Injection System, Check Engine Light, Indicator Lamp, Engine Exhaust and a lot more. We are sure that now all your issues would be resolved.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

One must consult a qualified mechanic to use a digital volt/ohmmeter and an advanced scanner. In addition to these tools, the mechanic also needs to perform the following steps when diagnosing:

• Check the one-way check valves to make sure they are still working properly. This requires the mechanic to remove the check valve and blow through it both ways. If the check valve is working, air should only pass through the valve one way.
• Also check for any wiring, connectors, and components for damage.
• Next, visually inspect all secondary air injection system fittings and hoses. The mechanic should look for any cracking, breaking, or other damage.
• Inspect the fuses associated with the secondary air injection system. The mechanic can use the manufacturer's service manual to determine fuse locations.
• If the fuses blow after replacement, diagnose the secondary air injector pump for failure. Clear the code and test drive the vehicle to see if the code returns. Also check for PCM failure that may require repair or reprogramming.

Common Mistakes When Diagnosing the P0419 Code

It is important to follow all the diagnostic steps properly. One of the most common mistakes made here is assuming that the pump has failed and replacing it without checking the wiring harness for damage or the connections for corrosion. Because of its location, it is possible for the wiring harness to be burned by hot exhaust gases.