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Hole in exhaust before oxygen sensor!? (archive)

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Posted by Rick on January 10, 2001 at 15:20:09:

Does anyone know if this would cause a change in the signal the oxygen sensor sends to the "brain"? I just noticed there is a hole in the pipe right next to the tranny, before the oxygen sensor? I'm getting about 20/21 mpg mixed driving right now. TIA

'87 535is 154k
New BMWCCA member

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