What does code P0418 mean?

Secondary Air Injection System Relay A Circuit: The secondary air injection relay circuit has a fault.

P0418 is rated as medium severity. Schedule service — affects performance or emissions.

P0418

Secondary Air Injection System Relay A Circuit

Powertrain Code · Medium

What does P0418 mean?

The secondary air injection relay circuit has a fault.

System: Emission Controls

P0418 is a powertrain diagnostic trouble code indicating secondary air injection system relay a circuit. This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.