I have a 1998 S70 GLT. 9 months ago the CEL came on for code P0440. I replaced the canister purge valve and the problem went away for a while. About a month ago the CEL came on for P0440 again. I thought 9 months was a little short for the purge valve to last, but I checked it and it didn't hold a vacuum, so I replaced it. Now just a week later, the CEL came on again, again for P0440. I checked the new purge valve and now the new one doesn't hold a vacuum. The car runs fine; no change in behavior.

I don't think it's related, but 2 months ago I noticed oil was being forced out where the turbo oil return line enters the oil pan so I replaced the gasket and o-ring like it says in Bay 13.

I there something else that could be wrong with the car that could be damaging the purge valves? Could the turbo oil return line repair be related?

I checked for a vacuum using a rubber squeeze bulb from my Prestone anti-freeze tester. I removed the purge valve from the car, squeeze the bulb, pushed it onto the purge valve, and released. I did this when the valve was brand new and it held a vacuum. Was that a good way to test?

Thanks,
Dave