Hi everyone I have had about 15 trackers since i have ever started driving have always loved them great cars so I picked up an 02 chevy tracker zr2 2.5 4x4 4door automatic I got a good deal on it because it had o2 sensor codes in it so bought it replaced all 4 o2s light came back for the o2s so I replace the converter on driver side since bank 1 sensor 2 was the first code that came back and then the other 3 followed so with that said replaced all 4 o2s and the converter and am still getting same codes please help I'm stumped I've never had this problem before on other trackers

 

My 2001 2.5L Chevy Tracker 4x4 4-door automatic has 14 DTC's for the O2 sensors:
P0131 02 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0132 02 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0134 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 02 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0141 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0151 02 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
P0152 02 Sensor Circuit High Voltage (Bank 2 Sensor 1)
P0153 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0156 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

Four of them are heater malfunctions:
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)


Other than the PCM the heater relay circuit is the only thing I know common to all four oxygen sensors.