96 trooper check engine light pull codes how
 

Gotta 96 trooper w/ new trans,alternator just done.Now check engine light on. It,s my friends car and i,m an old school mechanic and understand some but not enough to help!Do i have to go to Isuzu to pull codes? 165,000 on the odometer. Older American cars had a reset,is it that easy or is something else tripping the check light? Engine runs like a swiss watch,no missfire i can detect. HELP! My 89 caravan disconnect battery will reset,will this work for the trooper?