P0416 Code - Secondary Air Injection System Switching Valve 'B' Circuit Open

What Does P0416 Mean?

The PCM reads the condition of the secondary air injection system in increments of pressure and flow, which translate to input voltage from sensors. If input readings fluctuate by more than ten percent, a code will be stored and the malfunction indicator lamp (MIL) will illuminate. Some models require multiple drive cycles for the MIL to illuminate, but the code will usually be stored on the initial incident.

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What are the common causes of P0416 ?
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 P0416 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0416 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

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