check eng light is on, used scen tool but no codes show, very bad mpg
Mar 7, 2013 at 8:14 AM
1999 Jeep Grand Cherokee Check Eng Light On Used Scen Tool Codes Show Very Bad
GENENEEDSHP
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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 12:02 PM
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