I have a 1997 Wrangler Sport with 4.0 manual transmission. I just bought it and have been repairing things. I noticed the fuel vapor line was rusted completely off.... just curious if my check engine light should have picked that up? I do know my 4WD lights do not work on the dash...... Will this particular vehicle run without a working "check engine" light? Could someone have disabled the check engine light? Could the bulb have been removed?