01 sl check engine light

in Saturn
I have an 01 Sl. It's throwing a tune up code. I just had the spark plugs replaced but apparently the "mechanic" my x had fix it put in 2 different sets of spark plugs. Could this be part of the reason the check engine light is on?
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John
I got the same code problem a few years ago and some posts on this forum pointed it out to me and I replaced the intake gasket myself back in 2008.