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P1421 BMW - 328I (1997) wHAT DOES THIS MEAN

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My 1997 BMW 328i engine light trouble code P1421. What does this mean

Vehicle: 1997 BMW 328I V-6 Engine

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P1421 Secondary air injection

This is the secondary air injection system , check the operation of the secondary air pump, this code condition is usually a failed air pump ,

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