If you do not have a scanner, go to one of the big box auto parts stores and see if they will reset DTC for you or let you use their scanner and reset it yourself.
or
purchase an inexpensive scanner that has the ability to reset DTC's (parts stores have them for sale around 40 bucks that will do the job)
or
remove negative battery cable and let it set overnight with it disconnected, then reconnect cable and it should be reset.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve