split air 1 circuit malfunction

2004 BMW 325

64,000 MILES • 6 CYL • 2WD • AUTOMATIC

FGARCIA1

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I have a trouble code of P1418 - split air 1 circuit malfunction. What does this mean and where is it located on my car? Is it a major repair or is it something that I may be able to fix myself? I appreciate any input. Thanks

Nov 13, 2009 at 4:54 PM

DOCHAGERTY

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9,603 POSTS

This is for the secondary air system for the exhaust I would check the vacuum supply hose first then check the electrical connector at the air pump. Here is the location of the air pump. There is also an air injection pump relay that needs to be checked as well.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below)

Please let us know what happens.

Cheers

Image (Click to enlarge)

Nov 14, 2009 at 10:02 AM

FGARCIA1

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Thanks for your help it was the relay I replaced it and cleared the codes all good now

Nov 17, 2009 at 10:12 AM