1999 Jeep Grand Cherokee Check Eng Light On Used Scen Tool Codes Show Very Bad

1999 JEEP GRAND CHEROKEE
80,000 MILES
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GENENEEDSHP
  • MEMBER
  • 1 POST
check eng light is on, used scen tool but no codes show, very bad mpg
Mar 7, 2013 at 4:14 PM
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CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,309 POSTS
Was the battery disconnected? There has to be a diagnostic fault code if the Check Engine light turned on. Disconnecting the battery would erase it. You can also read the codes by cycling the ignition switch three times from "off" to "run" within five seconds without cranking the engine. Watch the numbers show up in the odometer display.
Mar 7, 2013 at 8:02 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.