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Originally Posted by JupiterBMW
Thanks. How did you know it was the post cat O2 sensor and not the precast? I bought the pre-cat one because the parts guy at the dealer was saying that they've never had to order the post cat, but they typically keep the pre-cat in stock, makes me think this might be a common failure.
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Bank 2 oxygen sensors monitors cats, so is postcats.
Bank 1 monitors manyfold, sensor placement is pre-cat
Makes sense ?