steck

Yesterday morning on the way to work my emission warning light came on I have a 2004 TL Auto with approximiately 98,500 miles. I went to Auto Zone today and the code is P2251 i.e. O2 sensor. From earlier threads I saw from year's ago ironically enough the sensor seems to go out at 100K how coincidental.

My question is what will happen if I do not replace the O2 sensor, I live in SC and there are no emission inspections but the person at Auto Zone said I would notice worse gas mileage and the car may stall. I have to drive out of town this weekend and will have to worry about getting fixed next week since I don't have time to get fixed this week.

How difficult is it to replace the O2 sensor before the Catalytic converter and does anyone know of a place to buy that is less than the $129 Auto Zone quoted? Is the person correct at Auto Zone that I will notice much worse mileage and the car could start stalling? Thanks in advance for the advice.

Iqbal Ik

i am in the same boat as u man...trying to figure out with one i need to replace! but yea low mpg and stuff is what would happen if you dont fix it..good luck!

steck

My go to repair man said it would take awhile before I really notice bad gas mileage and it matters which O2 sensor is bad. I plan on getting the sensor replaced if I start noticing bad gas mileage and other issues. Just a matter of timing and how much the sensor costs.