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How do I find which sensor is bad. My car has four 02 sensors?

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How do I find which sensor is bad. My car has four 02 sensors?

Vehicle: 2007 Saturn Aura 3.6L
related to an answer for: 2007 Saturn Aura 3.6L with engine code P1174, can I fix this myself?

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Hi there,

To determine which sensor is bad you start with the code. If the code isn't specific to the sensor that is failing, you will need a scan tool that can read the live data.The live data should show a difference between the sensors and you would be able to determine which one has to be replaced.

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