O2 Sensor need help

[mrmilbro]

i kinda need some help about 1 month ago i bought the sensor thats past the cat and then month later the engine light comes on its the sensor it says on the Diagnosis computer that it is a heater malfunctioning sensor 2 so i go back and then they exchange it for a new sensor. Then a week later it happens again so i was woundering why is it doing it again? any ideas? thanks

[wafrederick]

Do you top off the gas when you fill the gas tank?If you do that,do not top off the gas tank,stop when it clicks.That is what happened to my grandma's car,my father replaced the oxygen sensor 3 times but, it was a Saturn.My father found out after asking her this.She topped off the gas tank and it set off the check engine light.I found out about this from a Vetronix rep my father knows.

[Tookie]

Originally Posted by wafrederick

Do you top off the gas when you fill the gas tank?If you do that,do not top off the gas tank,stop when it clicks.That is what happened to my grandma's car,my father replaced the oxygen sensor 3 times but, it was a Saturn.My father found out after asking her this.She topped off the gas tank and it set off the check engine light.I found out about this from a Vetronix rep my father knows.

I agree with you. Overpressures can occur inside the gas tank when cold fuel warms and overpressures the fuel delivery components. I expect this results in a very lean mixture at the cylinders; which could dump still volatile exhaust into the cat, and burn up the O2 sensor.
It could also be the cat showing signs of wear.
Seems logical anyways.
Good call imo.