o2 sensor help?
How many o2 sensors are actually on a 2002 bmw 325ci
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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