What does secondary air injection system incorrect flow mean?
Diagnostic trouble code (DTC) P0411 stands for “Secondary Air Injection Incorrect Flow Detected.” This code warns about a potential airflow issue in the secondary air system.
What could cause a P0411 code?
Excessive carbon buildup within the air injection passages and/or disconnected or damaged air injection hose(s) will also trigger a P0411 trouble code. To test the AIR Injection system the first thing you’ll want to find out is whether the AIR injection pump is working or not.
Can a O2 sensor cause a P0411 code?
What Does Code P0411 Mean? Diagnostic Fault Code P0411 is indicative of a general lack of flow from a vehicle’s secondary air injection circuit. In turn, this lack of airflow is registered by the affected vehicle’s O2 sensors and is recorded by the PCM/ECM as a diagnostic fault.
How do I fix error code P2431?
What repairs can fix the P2431 code?
- Replacing the secondary air pump.
- Repairing or replacing a wiring harness.
- Resolving poor electrical connections.
What is a secondary air injection check valve?
An ACDelco GM Original Equipment Secondary Air Injection Check Valve prevents exhaust gases from flowing back through the air injection system, and is a GM-recommended replacement for your vehicle’s original component.
What does a secondary air injection check valve do?
Secondary air valves are an integral part of the secondary air system. They are fitted between the secondary air pump (1) and exhaust manifold. They prevent pressure peaks in the exhaust flow from damaging the secondary air system and exhaust gas or condensate from entering the secondary air pump.
Is secondary air pump necessary?
The secondary air injection pump (also referred to as a smog pump or SAI pump) is responsible for lowering the number of carbon emissions that come out of the tailpipe of a vehicle. This is necessary since a vehicle engine is never 100% efficient in the combustion process.