P0418 Code - Secondary Air Injection System Relay 'A' Circuit Malfunction

What Does P0418 Mean?

Regarding the P0418 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter. When you see P0418 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0418 ?

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 P0418 ?

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.



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