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Steve 1/29/2013
2007 Saturn Vue Base 6Cyl3.5L - Engine
What causes o2 sensor to go out? I have replaced all of them on my 2007 Saturn Vue 3.5 and bank 2 sensor 2 3x in 20k.
I replace all the sensors and bank2 sensor 2 . 3 x in 20000. I just replaced it again and the check engine light came back on and still shows the same code, p0157.
The car cars fine and gets 20 mpg - 25 mpg hiway.
2 Answers
  • George
    George 1/29/2013
    Try resetting the ECU.
  • Walker Pro
    Walker Pro 5/7/2013

    Unfortunately, I am not sure what might be your problem, but I have some suggestions. However, if you have coolant leaks into the combustion chamber it may cause rapid poisoning of the O2 sensors. Have you been using good quality sensors? The correct Walker sensor numbers for your vehicle are as follows:
    The upstream sensors for both the front and rear will be Walker 250-25001
    The downstream sensor for the front is Walker 250-24346
    The downstream sensor for the rear is Walker 250-24391

    If you have any further questions or concerns please contact us and we will be happy to help.

    Walker Pro (

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