The code is P0135 O2 1/1 Heater Circuit Malfunction... I know I should check voltages and such, but I think I'm going to just replace the sensor and see if that clears it first. This is the original o2 sensor that came in the jeep back in 2001... And has lasted over 340,000 miles... My question is... Is this the type of part that you have to change in pairs? Maybe even all at once? LoL.. I'm down to change the one but I'm hoping I don't have to change all of em...

I have replaced them one at a time. On the last one now at 98000. First two at 40 third at 80 now the last.

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Ironman HD springs, Bilsteins, MLL's, Mopar skids 245 75 16 Treadwright Claw's.