P0418
AIR System Control A Circuit
P0418 is an OBD-II diagnostic trouble code meaning: AIR System Control A Circuit. Common causes: secondary air system solenoid valve malfunction, open or shorted wiring harness. Estimated repair cost: $33–167.
Symptoms
- Check Engine Light Is On
- Deterioration in acceleration dynamics
- Increased fuel consumption
- Unstable engine operation at idle
Causes
- Secondary air system solenoid valve malfunction
- Open or shorted wiring harness
- System relay malfunction
- Problems with the engine control unit (ECU)
- Mechanical damage to system components
How to Fix
- Check the integrity of the wiring harness and connections
- Test the functionality of the solenoid valve
- Check the secondary air system relay
- If necessary, replace faulty components
- Reset the error code and check if it returns
Related codes
Error P0418 by Vehicle Brand
FAQ
What does the P0418 code mean?
P0418 is an OBD-II diagnostic trouble code that indicates: AIR System Control A Circuit
What causes a P0418 error code?
The most common causes of P0418 include: Secondary air system solenoid valve malfunction; Open or shorted wiring harness; System relay malfunction; Problems with the engine control unit (ECU).
How do I fix a P0418 diagnostic trouble code?
To fix P0418: Check the integrity of the wiring harness and connections. Test the functionality of the solenoid valve. Check the secondary air system relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0418?
Limited driving only, diagnose soon
How much does it cost to fix P0418?
The estimated repair cost for P0418 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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