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Bank 1 Sensor 1 is the upstream. Its on The Header where they all meet. it may not bwe the problem though seeing as i have the same code and just changed my o2 sensor and the code came back. Bank 1 Sensor 1 is the upstream. Its on The Header where they all meet. it may not bwe the problem though seeing as i have the same code and just changed my o2 sensor and the code came back.

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Q: When refering to p0131 bank 1 sensor 1 are they refering to the up stream or down stream o2 sensor?
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