Ok well lets start with about a lil less then a year ago i had to replace my engine. After engine was replaced CEL was on for heated o2 sensor bank 2 sensor 2. so i replaced that sensor. My dumba** never went to get the CEL cleared till recently. Well after clearing it within ten minutes of driving it came back on for the same thing. Since the sensor was under warranty i just replaced it again. But sure enough 10 minutes after clearing the CEL it threw the same thing again. Any help would be appreciated i need to get her inspected.

 

Stupid question...but are you changing the correct sensor on the engine? There are 4.

 

this might help

 

also what code is it throwing, there could be multiple reasons:

P0157 INFINITI Heated Oxygen Sensor Sensor Circuit Low Voltage Bank 2 Sensor 2
P0156 Rear Heated Oxygen Sensor Left Bank
P0137 INFINITI Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2
P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P1167 INFINITI Heated Oxygen Sensor 2 (Rear) Maximum Voltage Monitoring (Bank 2)
P1147 INFINITI Heated Oxygen Sensor 2 (Rear) Maximum Voltage Monitoring (Bank 1)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0159 O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0142 O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

 

and also is it a oem o2 ive seen the autozone sensors are senseative and dont work well

 

yes i am replacing the correct one. lol i am using a bosch sensor from napa. $170 freaking dollars lol. I am not sure the exact code it is throwing i will have to check again.

 

well i must say im a infiniti tech i see several folks come in with your same problem and the napa ones dont always work oem will work most likly