Hi Yes I've recently worked a great deal on this. Your air pump is probably filled with water (ours was and is shot!)... and or the Check valve is stuck. On our 98 I "just" changed all of this last week. I want to say I've just about licked this problem with the help from the volvospeed.com site (see BAY13 there's a great link to a site about this problem (P410 code) (Also see chiltons) . I'm still waiting to see if anyone can help me with the verification of the airpump since it wont run unless the engine is cold and mine won't anytime?
Good Luck
D~
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