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This has happened to me a lot on my 2002. After having it "fixed" at the dealer (with a $45 diagnostic), I finally figured it out. Of course, it took me several oil changes before I realized what was occurring. Doh! Now every time I have my oil changed at the independent shop, I check to see if they inadvertently disconnected the hose. When they check the air filter (requiring the housing to be removed), the hose becomes disconnected and they don't have the sense to know they've disconnected the hose. The check engine light would come on about two days later with too much time passed to associate this with the oil change. Now, each time I have the oil changed, I check to see if the hose is attached, then hook it back up if necessary. It is a very simple process, and can be done with pliers to squeeze the spring clamp. Once the hose is re-connected, the light will go out after about 2-3 days.
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