ck engine light was on on 2003 Nissan Xterra

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ck e light on bout 2 wks, went to dealership they said it's because there are signs of head gasket leaking around head and upper block. to ck it out n find out for sure it's gonna cost $250.00 does not go towards repair, and if it needs to be repaired looking at almost $1900.00
(2) Answers
I'd be curious to know what codes were set, I can only imagine it was misfire codes. Have you have any driveability issues? Does the engine run rough during start up?