I've read this could be caused by bad hoses or the O2 sensor, which I'm going to replace as soon as the part gets here. Any clues?

I'm hoping it's not the air pump itself, though from what I've read so far if it was that it'd set a p0491 too. All I've got is the p0155 and p0492.


I sure wish my 02 sensors would get here already!

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2003 BMW X5 3.0i, Black Sapphire, 287,423 km and kicking!
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