SES O2 Sensor

[IrvW]

2001 I30 70K

SES light came on. I took it to AutoZone and they said it was the O2 sensor, high voltage. They reset it and the light was off for about 300 miles, then it came on again. Later on I took a long trip and the low fuel light came on, as my tank got very low. I filled up the tank and and when I stared the car the SES light was off. Again it was off for about 300 miles, I think, and then it came back on again. One day I was driving and I noticed that the light was off once again. It stayed off for several days and then it came back on again. Does anyone know SES light came on. I took it to AutoZone and they said it was the O2 sensor, high voltage. They reset it and the light was off for about 300 miles, then it came on again. Later on I took a long trip and the low fuel light came on, as my tank got very low. I filled up the tank and and when I stared the car the SES light was off. Again it was off for about 300 miles, I think, and then it came back on again. One day I was driving and I noticed that the light was off once again. It stayed off for several days and then it came back on again. Does anyone know what's going on? I can buy the O2 sensor and replace it, but is the problem the O2 sensor or is the O2 sensor sending a message that something is wrong?? I am not sure what I should do???? on? I can buy the O2 sensor and replace it, but is the problem the O2 sensor or is the O2 sensor sending a message that something is wrong?? I am not sure what I should do????

I went to Advance Auto today. Results were:

P0138O2 Sensor Circuit High VoltsBank 1 Sensor 2

Where is this sensor??

Thanks for the reply.

[Q45tech]

Most post 1995 engines with 2 banks have 4 different O2 sensor.

[maxnix]

This is the way Q2 sensors fail.

It is the second sensor after the catalytic converter, I am guessing on the front side if the accessory drive belts are on the passenger side.