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E46 General discussion and technical help for 1999-2004 3 series cars.

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Unread 09-16-2011, 10:01 PM   #1

Name: zooyorkguy
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Your Ride: 2002
o2 sensor help?

How many o2 sensors are actually on a 2002 bmw 325ci
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Unread 09-18-2011, 09:29 AM   #2

Name: Manolito
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Join Date: May 2006
Location: Sacramento
Rate My Car: 339 / 340
Your Ride: (2) '97 328s; '04 330; '04 325iT
Four. Fronts and rears have different part numbers. Wire is different length, I presume.

Replace all four at once every 100k miles to make your life simpler. Mine on the 325it have 125k on them so I guess I should get around to doing that chore, but it has not thrown a code yet. I have been putting it off because it looks a lot tighter than my e36s, so I am not looking forward to it.

Replace them one at a time so you don't cross the wires.
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