My check engine light went on and I pulled the code: P0139. Looked it up and it said 02 sensor circuit slow response (bank 1 sensor 2).

What exactly does this mean and is it something I can do myself with limited tools or is it just worth bringing to the shop?

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2002 Cactus Green Renegade
3.7L 4x4 5-speed
Frankenlifted...
Al's Arms Gen 4.5
Gen Grabbers 245/75

Lots and Lots and Lots of pinstripping/gouges/scarring...

Easy - Just replace the 02 sensor downstream on the drivers side, - no special tools needed - just make sure your wires are good,about 40 bucks or so for a direct plug-in replacement.

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2004 sport 3.7
OME coil lift.
Clevis lift.
Mopar skids.
5-speed manual.
235 70 17 Firestone destination AT'S on stock rims.
Gen 4.5 a-arms

reset it and see if it comes back....had that same code on the wife's '09 caliber and only 13k....reset it and it hasn't come back

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'03 Liberty w/3.7L & 45FRE Tranny
Revetek 2" Lift & JBA Gen 5 A-arms
Maxxis Buckshot XMT Mudders 31x10.5 on Soft 8's
Jet Stage 2 Chip : '07 Air Intake
Relocated IAT Sensor : '05 HVAC Controls
Front Hitch : EVIC from '01 GC : Custom Rock Rails
Transgo Shift Reprogramming Kit
KC Driving Lights & Aux Backup Lights
.......all GONE!