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below threshold
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  1. E39 (1997 - 2003)
    Keep pulling a EA code (catalyst efficiency below threshold cyl 4 - 6) on my Peake scanner and based upon research from all over the web, I am going to try replacing the post-cat oxygen sensor for cyl 4 - 6. The only problem is that I do not know which side of the car this sensor is on. Anyone...
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