Probably just a different length wire is the difference. Rockauto has different Mopar part number for left downstream that you reference. Left is drivers side in USA at least.

 

It looks like 05149171AB replaces the part number that rockauto has. Thank you!!

 

Good luck with the replacement. On my '12 JKUR, I was able to replace my upstream sensor, but I could not get the downstream sensor to budge, even with a very long extension on the breaker bar. Tried heat, tried everything and no go.

 

I am in the same situation with a 2015 JK Rubicon Hard Rock Edition. Throwing a P0157 Bank 2 sensor 2 code. 05149171AB is the one I am pretty sure I am supposed to go with. But aside from cable length as another person stated, I want to say one of the sensors is 2 wire (the one I need) and the other is 3 wire. I am scared to deviate with another cable like an NTK. I looked at those connections, and some of them have 4 wires. Yet they claim to be for the JK.

 

Question: Is this "O2 Sensor" required to be functional for the engine to run? Or it's just to comply with regulations when it comes to "catalytic converter"?

 

@HoldMyBeer i tried to replace upstream myself and couldnt. I’m not sure I had the right tool as the shop was able to do it rather quickly. Luckily they were able to do the downstream as well with no issues to my knowledge.