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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 01-27-2012, 11:31 PM   #1
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Join Date: Apr 2011
Location: San Luis Obispo, CA
Posts: 1
My Ride: 325 Ci
Oxygen Sensors?

I bought Bosch oxygen sensors for my wifes 2002 325 Ci, not because they were bad but because with 110,000 miles they will be bad before too long. According to the part dealer the car required one before the catalytic converter and one after. When I went to install them I found TWO before the catalytic converter and NONE after.

I see the need for the two before the cat because there are two exhaust manifolds ( 3 and 3) but if there is supposed to be one after the cat I have no idea where it would mount.

Anyone have any experience with this?



Last edited by rried; 01-27-2012 at 11:32 PM.
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