P0411 Subaru Secondary Air Injection System Insufficient Flow

Possible causes

– Vacuum hoses damaged or pinched
– Faulty Air Pump inoperative
– Faulty Air Pump harness is open or shorted
– Faulty Air Pump circuit poor electrical connection

What about the obd code?

The AIR system does not meet the expected flow rate during testing

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine hesitation

P0411 Subaru Description

The Secondary Air Injection (AIR) System aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50