I put a brand new o2 sensor in and still have the same code

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Are you absolutely sure that you replaced the correct side sensor. It has two front (upstream) oxygen sensors. Aftermarket intake or exhaust components can cause this code. Poor connection at O2 wires possible. Could be wrong part number sensor.

P1522 is not an O2 code in any Mazda model. Please go to this LINK and read about it.

crack could cause o2 sensor to read inccorect and light to come on..

You did not mention if you replaced the o2 sensors. Chances are if the cats were bad, the o2 sensors were also burnt up. I would recommend changing the sensors anytime you change the catalytic converters.

code 44 set on pre 1995 gm vehicles is a o2 sensor reading lean or bias to .2 volts or less. it could be the o2 sensor, it could be a vacuum leak making the exhaust have too much oxygen thus making the o2 sensor to read lean or put out a lean reading. If the o2 sensor is old 75k-100k it's probably time for a new one anyway. an exhaust leak near (upstream) to the o2 sensor can pull in air even though the exhaust is leaking out and fool the o2 sensor with the added oxygen also. you could also have a fuel delivery problem creating a true lean condition. there are ways a tech can test an o2 sensor to see if it's the sensor or a mechanical problem causing the code.

Fords are bad about vacum leaks, check all vacum hoses repair as needed.Vacum leak will give an o2 sensor code.

did u change the right o2 sensor there is 2 sensors on bank1 and 2 on bank2.....upstream and down stream.....i had the same prob i changed the o2 senser to the other side to check and make sure it was the o2 senser....it took 4 o2 sensors before i got 1 that finally worked nd yes i was buying them brand new.....so change sides with it nd see if the code changes sides....and did u reset it with the code machine when u put the new 1 in?

P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

if you aren't getting the corresponding bank 1 sensor 1 code, P0135, you may have gotten the wrong O2 sensor, or perhaps it is defective? There is the chance that if you put some anti-seize on the O2 sensor threads or on the exhaust threads that you may have gotten something on the sensor itself clogging it up....

I believe sensor 1 is pre catalytic converter, but this code refers to the internal heater in the O2 sensor... so if all else fails, you may just have to buy or exchange for another and see if it helps your problem

Have You Checked The Catalytic Converter?