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O2 sensor question

738 Views 2 Replies 2 Participants Last post by  danielrhine
I have a check engine light on that says my O2 sensor is bad. I am catless so I'm not sure if that is the reason. I have an access port and have reflashed to a stage 2 map. I thought when you reflash the light is supposed to stay off permanently. Also how can I check to see if my sensor is bad without going to the dealership?
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What was the code? I'm sure it's cause your catless though
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