P0139 Hyundai -ELANTRA

Question

I HAVE ALREADY REPLACED THIS SENSOR BUT LIGHT COMES BACK ON AFTER SOME MILES

Answer 1

Hi there,

Since replacing the sensor has not solved the issue, it is possible there is faulty wiring to the sensor, or possibly an issue with the fuel injectors. Here is some more info for you.

P0139 HYUNDAI - HO2S Circuit Slow Response Bank 1 Sensor 2

Read more: https://www.autocodes.com/p0139_hyundai.html