1996 Aerostar check engine light

Last December I had the van repaired for check engine light on, at Ford dealer. They replaced a couple of parts, can't remember what they were called except one was a solenoid.
Anyway, the check engine light came back on about 2 months back, and due to low financies I just let it go. Then after being on for 2 months or so, it went off, and hasn't came back on after about 3 weeks. All that was done is I changed the oil and filter 2 or 3 days before the light went off. I don't think that would have anything to do with the check engine light. Or would it? (The oil wasn't low, nor especiall diry when changed.)

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