Check eng light is on, used scen tool but no.

Tiny
GENENEEDSHP
  • MEMBER
  • 1999 JEEP GRAND CHEROKEE
  • 80,000 MILES
Check eng light is on, used scen tool but no codes show, very bad mpg
Thursday, March 7th, 2013 AT 4:14 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 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.
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Thursday, March 7th, 2013 AT 8:02 PM

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