Fault Code P0418
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0418
Secondary Air Injection System Relay 'A' Circuit Malfunction
Code P0418 indicates a malfunction in the 'A' relay circuit of the Secondary Air Injection system. This system helps reduce emissions by injecting additional air into the exhaust gases.
Part Details
Part Name
Secondary Air Injection Relay
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪250 - ₪750
Engine Location
Engine compartment
Symptoms
- Check Engine Light on
- Emissions test failure
- Slight engine performance issues possible
- Noise from SAI system
Possible Causes
- 1Faulty SAI relay
- 2Damaged wiring in relay circuit
- 3Loose connections or corrosion
- 4ECM/PCM failure
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