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Q: Ihave a check eng light on code P0153 which sensor is bank 2 sensor 1 simple ter on 2003 Jeep Liberty

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in simple terms which sensor is it, example left side front
(1) Answer
That is the passenger side upstream oxygen sensor. It is locatedon the rear end of the exhaust manifold. The dealership should replace it free of charge.
repair rhe code you need:
Check and fix any exhaust leaks
Check for wiring problems (shorted, frayed wires)
Check the frequency and amplitude of the oxygen sensor (advanced)
Check for a deteriorating / contaminated oxygen sensor, replace if necessary
Check for inlet air leaks
Check the MAF sensor for proper operation
Replace the Bank 2 oxygen sensor upstream of the catalytic converter
hope help.