I have a 2004 Jeep Liberty Renegade with ~97,000 on the odometer. About a month ago, a few days after I had my clutch bearings replaced, my check engine light came on for the 2,2 O2 sensor; so basically an error with the passenger side O2 sensor after the catalytic converter. I replaced the sensor and after around 50 miles the check engine light turned on again. I then replaced the plugs and got another new O2 sensor and again, after about 100 miles, it’s back on again for the same error code. I have heard talk about this being caused from a failing fuel pump, which is failing to pump enough fuel to the engine. However, this seems counter intuitive, if this was the issue I would assume that both banks would read an error. So, before paying a mechanic to rip apart my rig and repair/replace things that I have already done myself; does anyone have any ideas that might resolve this issue?

Is it only the MIL (check engine light) or do you have other, assorted indicators illuminating or making noises?

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2006 Libby Sport, Jeep green, all stock - Purchased 7/1/09 with 33K miles
2003 Renegade, Cactus green - Destination MT's in 245/16, skid plates, tow hooks, Alpine w/iPOD, side window air deflectors, Rennie light bar, Daystar 2.5" lift.
Purchased 12/28/09 with 53K miles
"Never hit a man with glasses. Hit him with a baseball bat."

It's just the standard orange illuminated engine icon, nothing else.

Bad converter ?

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2003 KJ Renegade, 5 speed, frankenlifted,Al's a Arms 4.5,Moabs 245/75/16 BFG KM2's, custom rock rails, full Mopar skids, Hella ff220 lights,Hd cooling,Front DTT,Riddler diff cover,Rola safari rack,Cobra 29 peaked & tuned.

Pastafari Alum, Pink shovel recipient

Yeah, I think the catalytic converter might be an option, drove around with the light on the first time for about two weeks before I had the time to replace the O2 sensor, so my procrastination may have caused me to cook my cat. Also over the weekend, I went to start it and it sputtered and died. Had to wait 5 min before it would fire up... I've never had an issue with it starting before. But I guess when it rains it pours... I’ve never had any problems with the vehicle since I bought it besides the regular upkeep, but this year alone my water pump, power steering pump and clutch and clutch bearings crapped out on me.