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I'm having the same issue with my 2001 2wd 2-door. I replaced both O2 sensors with Denso universals. With my OBD tool, I see activity on both sensors. I just can't get rid of p0135 & p0141!!!
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P0135 - Front O2 sensor heater malfunction.

P0141 - Rear O2 sensor heater malfunction.

Check both O2 sensor heater fuses. You might have blown them when you initially wired the sensors incorrectly.

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.