95 Geo Metro check engine light

Geo Metro "check engine" light was on . Dealer got confusing codes . One for EGR, one for celanoid, one stating sending unit. They said come back another day,leave car for whole day. I drove home ...Light did not come on!!!! WHAT THE *^#$@&* IS GOING ON???

Geo Metro "check engine" light was on . Dealer got confusing codes . One for EGR, one for celanoid, one stating sending unit. They said come back another day,leave car for whole day. I drove home ...Light did not come on!!!! WHAT THE *^#$@&* IS GOING ON???


stating sending unit? I don't know what that is but clean the EGR, clear the codes, & drive to see if thay come back.