Hello. I'm new to the forum and hoping to gain some insight to my issue. I very appreciate feedback. I'm needing help as my inspection is due and the service light on the dash is illuminated. 6 months ago, the Oreilly Auto store code reader pulled p0170 and p0125. The dealership pulled the same codes and advised me I needed to replace the Bank 1 Sensor 2 O2 sensor. So, 6 months ago, I replaced the O2 sensor on the passenger side/rear of the vehicle. I erased the codes but the codes are still popping up/the service light is still illuminated. The coolant level is good.

Do I need to replace additional O2 sensors? If so, which sensor(s)? Could there be another issue other than the O2 sensors?

 

I should add, I did not use the universal fit O2 sensor. I used the direct fit BOSCH O2 sensor.

 

*Update - The Service Engine Soon light went off and I've passed Inspection.
Reluctantly, I purchased and installed a new Bank 1 Sensor 1 O2 sensor (front passenger side). OReilly advised I must drive about 75 miles on the car before the computer would reset. So, I drove and about 80 miles later, the Service Engine light went off. Prior to paying for the inspection yesterday, I told the tech of my ordeal. He said I should drive 50-100 miles "AFTER" the Service Engine Soon light went off so the computer would cycle and erase the codes. So, I drove about 50 miles. As I mentioned, my '01 Mitsu Montero Limited passed inspection. Yippee! Total cost was about $200 for both O2 sensors.