1 Or 2 O2 Sensors? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 01-12-2005, 11:28 AM
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My check engine light is on and I'm pretty sure its the O2 sensor because a
mechanic told me it would need to be replaced soon. Planning on doing it myself
but I'm confused on whether there is 1 or 2. All the parts sights say 2, but all the
service manuals only give the indication that there is 1. Have 328i, '97.

Also, do I go Bosch or NTK? $45 difference.
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#2 (permalink) Old 01-12-2005, 11:58 AM
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Actually you have 4.
2 before the cat and 2 after.
I think the 4 cylinders only have 2.

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#3 (permalink) Old 01-12-2005, 01:21 PM
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OBDI has one O2 sensor, but yours is OBDII so you have to replace 2 sensors. I've never heard about 4 of them in a 6 banger....

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#4 (permalink) Old 01-12-2005, 01:27 PM
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OBDII does have 4 O2 sensors. The 2 pre cat sensors are regulating while the 2 post cat sensors basically analyze the emissions to make sure the pre cat sensors are doing their job. This is for US versions at least, to cut back on smog levels and make the cars more "environment friendly".

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#5 (permalink) Old 01-12-2005, 02:44 PM
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so which one do you have to replace when your 02 sensor goes out?

David
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#6 (permalink) Old 01-12-2005, 02:49 PM
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Quote:
Originally posted by bigred318@Jan 12 2005, 11:44 AM
so which one do you have to replace when your 02 sensor goes out?

David
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Generally if you pull codes, it indicates which bank, and whether it's before or after the cat. Or, you could break out a multimeter and check them individually, or just replace all 4, because if one's gone bad, the rest are usually on their way.
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#7 (permalink) Old 01-12-2005, 03:12 PM
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wow well i guess we learn something new each day, i thought there might be 2... but 4 that was a surprise

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#8 (permalink) Old 01-12-2005, 04:31 PM
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Usually the ones that go out are after the catalytic converters.
Yes there are 4 on OBD2 and 2 on OBD1

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#9 (permalink) Old 01-12-2005, 04:40 PM
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OK, there's conflicting information on this thread regarding pre-96 OBDI E36's.
Do they have one O2 sensor or two???
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#10 (permalink) Old 01-12-2005, 05:06 PM
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OBD I bimmers only have one sensor. Pre-cat.
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#11 (permalink) Old 01-12-2005, 05:31 PM
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I would replace all four -- or at least a whole pair on whichever side of the cat you have a fdailure -- with Boschs.

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#12 (permalink) Old 01-12-2005, 06:07 PM
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hahahha we keep jumping around with numbers research time! or autotech? where are you!! haha

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#13 (permalink) Old 01-12-2005, 08:27 PM
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A 97 model 3 series is an E36......only the E46 has 4 oxygen sensors....


When in doubt, crawl under and look.
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#14 (permalink) Old 01-13-2005, 12:49 PM
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Sorry Tech but you're incorrect.
I have a '96 328 and I have 4 O2 sensors.
O2 sensors are pretty expensive so if you replace all 4 that will cost you alot of money...even if you do it yourself.

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#15 (permalink) Old 01-13-2005, 01:18 PM
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1995 and older- OBDI = one
1996 and newer-OBDII= four

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