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What is the definition of a fault code PO1421 on 99 BMW 323i ?

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  • ddurso162 Aug 02, 2009

    yes thank you

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HI. your code definition is below with the possible causes as well.

Trouble Code: P01421


Secondary Air Injector Valve Circuit Short to Ground

Possible Causes:


Connector to the secondary air injection valve is loose or disconnected

Secondary air injector valve circuit shorted

Secondary air injector valve circuit is open(inoperable)

Faulty secondary air injector valve

Replacing this failed component will fix this issue.

Posted on Aug 01, 2009

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