P0418

AIR System Control A Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

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

P0410 P0411 P0412 P0413