Q: What's happening when the 'check engine soon' light comes on? on 2007 Nissan Xterra

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Had tune up February 2012. Are there recalls about this problem? Truck purchased at Nissan dealer. Is this the best place to have it repaired (cost).
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Where was the 'tune-up done , what parts were involved (dealer/aftermarket) What's the mile now and when the tune-up done?Odds are they're not related issues.
Hi, Thanks for reply. Took truck to Nissan Dealer. Full diagnostic test done. There was an emissions problem; signal codes not reaching correct target, possibly from dropping and cracking ignition key :{
Insurance paid $50 diagnostic fee. Key & alarm system re-coded at $75 out-of-pocket.