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Can we have the year, make, model and engine size so we can narrow down the area of failure.
Did you have the code pulled for us???
make chevy cobalt 2.2l
ok, good start, now did you have the code checked??? there are over 1500 possibilities for codes
ok, now we are getting somewhere.
The code is for the secondary air system. there is a pump that adds air when cold to the exhaust to complete the burn process before hitting the cat converters. it is controlled by the computer. there is a pump. check valve and lines involed and the only way to check it is with a real scan tool that can turn the pump on and off on demand.
I have attached the description and the possibilities below.
Circuit/System Description The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. The secondary AIR injection pump provides filtered air on demand to the AIR solenoid check valve assembly. The AIR solenoid valve assembly controls the flow of air from the AIR pump to the exhaust manifold. The AIR pump relay supplies the current needed to operate the AIR pump. The AIR solenoid valve assembly has an integral check valve, pressure sensor, and solenoid valve. The pressure sensor monitors the air flow pressure from the AIR pump. The engine control module (ECM) supplies the internal pressure sensor with a 5-volt reference, a low reference, and a signal circuit. The signal circuit provides the control module with a voltage relative to internal AIR pressure changes.The AIR diagnostic uses 3 phases to test the AIR system:
During phase 1, both the AIR pump and the solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-15 kPa above BARO.During phase 2, only the AIR pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 15-22 kPa above BARO.During phase 3, neither the AIR pump nor the solenoid valve is activated. AIR pump deactivation is tested. Expected system pressure equals BARO. In all 3 phases, testing is accomplished by comparing the measured pressure against the expected pressure. The control module can detect faults in the AIR pump, AIR solenoid, pressure sensor, and the exhaust check valve. The pressure sensor can also detect leaks and restrictions in the secondary AIR system plumbing.Conditions for Running the DTC P0411
P0412 or P0418
Conditions for Setting the DTC P0411
Action Taken When the DTC Sets
Conditions for Clearing the MIL/DTC
Reference Information Schematic Reference Engine Controls Schematics (2.2L) (See: Powertrain Management\Diagrams\Electrical)Connector End View Reference Component Connector End Views (See: Diagrams\Connector Views)Description and Operation Secondary Air Injection System Description (See: Powertrain Management\Emission Control Systems\Air Injection\Description and Operation)Electrical Information Reference
DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions)Scan Tool Reference Control Module References (See: Testing and Inspection\Programming and Relearning)for scan tool informationSpecial Tools J 36169-HD - Heavy Duty Fused JumperCircuit/System Verification
Circuit/System Testing Secondary Air Injection Pump Malfunction
Secondary Air Injection Solenoid Malfunction
Secondary Air Injection System Pressure Low
Secondary Air Injection System Pressure High