Check engine light reset. -
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Unread 06-17-2010, 07:18 AM   #1
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1999 TJ Wrangler 
Join Date: Jan 2008
Location: Connecticut
Posts: 188
Check engine light reset.

Light came on. Had it scanned. O2 sensor was NG. Changed it. Runs like new again. Need to reset check engine light. Can I reset it with out the scanner?

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Unread 06-17-2010, 07:48 AM   #2
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If it's worth doing, then it's worth [I]over[/I]doing.

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Unread 06-17-2010, 07:52 AM   #3
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2005 LJ Wrangler 
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You can unplug the 4 wiring harnesses that hook up to the computer on the passenger firewall. Leave them unhooked for 30 sec then plug 'em back in. Be carefull to push straight in when hooking them back up. You will wipe the PCM clean and the Jeep will need to "relearn" idle and LT/ST fuel trims, but you will not erase the radio settings. Start the Jeep and allow it to idle a few minutes in park, then in gear, then drive it for about 10-15 miles after it has completely warmed up. You should do this anytime you replace o2 sensors.
-Darkstar, judy-judy. I'm going in for guns.
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Unread 06-17-2010, 07:54 AM   #4
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Join Date: Aug 2006
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Disconnect the negative battery cable.
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