P0412

2017-10-10

Description:

  • The fault code P0412 indicates that there is a problem with the circuit that controls the secondary air injection system switching valve A. This may cause the vehicle to fail emissions testing or cause the engine to run poorly.

Possible Symptoms:

  • Illuminated check engine light

  • Failed emissions testing

  • Rough idle or stalling

Possible Causes:

  • Failed secondary air injection system switching valve A

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

Related Parts:

  • Exhaust Pipe Air Injection: Air is injected into the exhaust gases for better combustion of unburnt fuel and pollutants. This allows better exhaust emission. Problems lead to harmful emissions out of limit

Possible Solutions:

  • Replace the secondary air injection system switching valve A

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

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