E36 Secondary Air Pump

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jclaw05 - 14 Jun 2007 23:06 GMT

E36- Have OBDII codes p1423, 1421 and 0420. Planning on replacing the
faulty o2 sensor this weekend and take a look at the Secondary Air
Intake Valve. Before I replace the pump itself, does anyone have any
suggestions on how to determine if in fact the pump is still
functioning? Or is it almost a given that, based on the three codes
above, the pump is dead?

Thanks

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mcquarrie - 16 Jun 2007 22:29 GMT

> E36- Have OBDII codes p1423, 1421 and 0420. Planning on replacing the
> faulty o2 sensor this weekend and take a look at the Secondary Air
[quoted text clipped - 4 lines]
>
> Thanks

I have had the same problem on my E36, except I didn't have the 0420
code. No it's not "a given" that the pump is dead.

When the engine is cold, and you start-it, the pump makes a noise like
a vacuum cleaner for about 90 seconds until the engine warms up. It's
also not too difficult to remove the pump and run it directly from the
battery to test it.

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