I too had the same codes (P0410 & P1411) on my 98' w/75,000 miles (summer only car)...my shop checked the pump and told me it was working fine and there are no loose hoses. They are now checking 3 "valves" in the system at the "low end" the parts plus labor will cost about $600 and at the "high end" $1,000. Depends on which and how many valves are bad. They told me they had to pull the manifold to get to it all.......
I'm not a mechanic so i must trust the shop. It's a good shop with a good reputation but I'm at their "mercy".
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