Cadillac Repair: service emission light on along with chk. eng. light, oxygen sensor, exhaust manifold

Question
1996 deville w/ problem code pc0153-current, pc0603-history, & no other
failure codes at the end it reads pcm? what is this telling me?

Answer
0153 = Replace the left side oxygen sensor which is the one in the exhaust manifold behind the radiator.

0603 means that the battery was disconnected.

replace the oxygen sensor and clear the codes from the computer and see if any return after driving the car for 15 minutes.