P0411 Code - Secondary Air Injection System Incorrect Flow Detected

What Does P0411 Mean?

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue. When you see P0411 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0411 ?

The most common causes of this code being stored occur in cold weather conditions. The secondary air injection pump is protected by using a one way check valve that is integrated into the air inlet hose. The check valve usually goes bad and allows condensation (water) from the exhaust to enter the pump, where it freezes in extremely cold weather. With ice inside of the secondary air injection pump, it binds and either causes catastrophic pump failure or overloads the circuit (usually blowing the fuse). Electrical wiring and connectors are also subject to being burnt by high temperature engine exhaust.

How do you troubleshoot P0411 ?

• Air pump replacement
• Removing carbon buildup from secondary air system
• Vacuum hose replacement
• Air solenoid replacement
• Repairing or replacing wiring harness issues

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