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You will have the check engine light on. Oxygen sensors throw very specific codes. Basically you need to use an error code reader. I did and it said the o2 sensor, in my Volvo 2001 s40 has two of them and I need to know which one to change?

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Q: How do you know when you need an o2 sensor?
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All O2 sensors are threaded into the exhaust system at various points. Most vehicles have more than one O2 sensor. Need to know which O2 sensor you are looking for, need more info.


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