CHECK ENGINE LIGHT GO AWAY

ALMOST THERE!!! On my way home from work, my check engine light came on.  I went to my very dependable mechanic. My 2003 Mazda Miata, my daily driver, gets me to work ontime car, needs $2000 to get it back on the road.  The timing chain needs replacement, and some sensors.  Most of the cost of the repair is for parts.  This is an economical and dependable car and I sure can't replace it for $2000. I work fulltime, but just don't have that kind of money floating around.   Please help if you can. Thank you