My 2010 Mazda 3 with 95k miles tripped a code a few weeks back for PO138: O2 sensor high circuit bank 1 sensor 2. I tried to replace the sensor with a new one but I couldn’t get the old one off since it was extremely tight even with the use of an o2 removal socket. The next day the check engine light mysteriously disappeared and upon erasing the codes and scanning again the code was gone. What kind of sorcery is this? Should I check the live data and see if my fuel trim is back to normal and not burning rich as a bad o2 sensor would cause?
Realize trouble codes come and trouble codes can go you computer every minute and a half or so rechecks everything and if you have a slight problem but it goes away such as if you have a little bit of bad gas the sensor will read weird but then when it burns off it'll read normal I wouldn't worry about it if it doesn't come back
I answered the same question it was repeated twice
My 2010 Mazda 3 with 95k miles tripped a code a few weeks back for PO138: O2 sensor high circuit bank 1 sensor 2. I tried to replace the sensor with a new one but I couldn’t get the old one off since it was extremely tight even with the use of an o2 removal socket. The next day the check engine light mysteriously disappeared and upon erasing the codes and scanning again the code was gone. What kind of sorcery is this? Should I check the live data and see if my fuel trim is back to normal and not running rich as a bad o2 sensor would cause?
Don't double post, please and thanks.
It was by accident. My apologies