My flex check engine light is coming on. Used seafoam in fuel, went off, but came back in a few days. Code is the 02 sensor which is showing a a sensor circuit malfunction. I know the 02 sensor codes can mean many things are wrong, but this sounds like a bad sensor?
Before I spend over $110 on a new sensor, I want to make sure I am replacing the right one. It is supposed to be the one that is easiest to change!!!! Bank 2 sensor 1 should be in the front, before the cat converter.
But I see 2 that look like they could be it. I removed one in attempt to clean it and doesnt look like that worked. If you can see the pics the hole to the left of the light is the sensor location I think it is. But there is one a little lower just to the right of the light. I think the hole where i removed it is bank 2 sensor 1, but want to make sure before I order one as the sensors are different.
Anyone know? 136k miles so dont doubt that it could be a bad sensor. But runs just fine. sensor.JPG 120.22KB 6 downloads