Air Injection System Control Solenoid Replacement Cost Estimate

Diagnosing the control solenoid for the air injection system varies by make and model, but generally the technician will attempt to actuate the solenoid with vacuum or through the engine control module via a diagnostic scan tool. If the solenoid fails to actuate in either direction, the solenoid will be replaced.

Most times the air injection system control solenoid will be mounted at the pump or directly on the control valve between the pump and the manifold. This means replacement may involve removing a portion of the metal line, the control valve, or an individual component located adjacent to the system. In any case, replacing the solenoid is a matter of disconnecting, removing fasteners of some type, and reinstalling the new solenoid. Some manufacturers may require that the solenoid is learned by the ECM before operation of the vehicle.

Since the air injection system uses rubber press-fit hoses and other components subject to deterioration, any time the system is serviced it is advised to perform a complete inspection of the secondary air system. This includes inspecting for exhaust leaks where the air injection system connects to the exhaust manifold or exhaust pipe.

Portions of this system become extremely hot to the touch as they are directly connected the the exhaust system. Any time this system is service, ensure that the engine has had adequate time to cool. Laser thermometers are advised to locate high temperature areas prior to servicing the system.

Replacing the air injection idle solenoid can either be very simple, or very difficult. Many vehicles will actuate the air injection control valve with vacuum, and many others will actuate the air injection control valve via a computerized electronic circuit. This means diagnostics of the valve will differ by vehicle, and may be more difficult or intricate than expected. Vacuum type solenoids are the only type recommended for replacement and diagnostics by the untrained DIY mechanic.