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So here's my question that i can't seem to get an answer for. I have a 2008 commander limited 4.7, last week i changed the passenger side downstream o2 sensor, can't remember the code but three days later i am getting this code, it says bank two cat low efficiency. could it be the new sensor is bad? Or is the new sensor detecting the cat is bad?
Any help would be greatly appreciated, i'd much rather spend 40 bucks than a thousand!
 

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I recall reading somewhere that aftermarket sensors don't work well with our systems. Did you replace it with OEM Sensor?
 
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