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Bank 1 refers to bank of cylinders. You probably got a triple code code that said something along the line of Bank 1 not optimal or something like that. What it means is that your first bank of cylinders running lean. This is usually caused by fuel injectors, or a leaky manifold. Give me your triple code and I will tell you more.

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โˆ™ 2007-07-27 02:17:45
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Q: Where is the bank 1 sensor 1 oxygen sensor located on a 1997 Mazda Millenia 2.5L 6 cylinder?
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