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

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).

by in San Diego, CA on July 04, 2012
1 answer 1 comment
ANSWER by on July 04, 2012
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.
COMMENT by on August 12, 2012
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.