The P0418 trouble code is associated with Secondary Air Injection System Relay “A” Circuit Malfunction, indicating an issue with the circuit of relay A in the secondary air injection system.
Secondary Air Injection System Relay “A” Circuit Malfunction
Code symptoms P0418.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Poor engine performance.
3. Increased emissions.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0418.
1. Wiring or connection issues in the circuit of relay A.
2. Faulty secondary air injection system relay A.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0418.
1. Inspect and, if necessary, repair any faults in the wiring or connections of relay A circuit.
2. Check and, if needed, replace the malfunctioning secondary air injection system relay A.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.