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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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Old 05-29-2004, 02:06 PM   #1 (permalink)
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I know this has been talked about a lot, but when I typed o2 into search I got errors so here we go. It's about a 100 dollar part correct? and how easy is it to install? my car seems to be idling kind of rough and I was told this is what it is. I checked and cleaned my icv already and it was fine so it must be o2. also I have brand new bosch plugs.
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Old 05-29-2004, 02:14 PM   #2 (permalink)
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yeah might be ur O2 sensors. You can get them at liek kragen for liek 80 if im nto mistaken.

Easy to replace if you knwo where it is. I dont know about your engine (i have an M20) btu it can be anywhere from below ur 6th cyclinger to near your tail pipe. Once you find it it is a simple job but may require a U-type tool to get to the other side. a simple plug from ur comp to ur xhaust managment.
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Old 05-30-2004, 02:26 AM   #3 (permalink)
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Before you replace it, use the check engine diag. It will tell you if the O2 is bad.
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Old 05-30-2004, 03:39 AM   #4 (permalink)
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When your car is OBDII there are two o2 sensors; one before and one after the cat.
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Old 05-30-2004, 07:40 AM   #5 (permalink)
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i tihnk OBD1 has 2 obd2 has 4, but im not sure... correct me if im wrong
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Old 05-30-2004, 08:03 AM   #6 (permalink)
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Originally posted by CiscoKid@May 30 2004, 03:20 PM
i tihnk OBD1 has 2 obd2 has 4, but im not sure... correct me if im wrong
OBDI has 1 and OBDII 2 sensors I thought.
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Old 05-30-2004, 08:14 AM   #7 (permalink)
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OBDI 2 sensors befor the cat
OBDII 2 sensors before and 2 after the cat
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Old 05-30-2004, 11:28 AM   #8 (permalink)
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obd I - just one
obd II - one before and one after the cat

autozone has a loan-a-tool program. for a deposit $, they will loan you some specialty tools for DIY projects. then return the deposit as soon as you turn in the tool(s) you borrowed.

for O2 sensor replacement, the deposit i think is $15.

just a reminder: be careful to suspend your car in secured jack stands when crawling under it.
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Old 05-31-2004, 02:55 AM   #9 (permalink)
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OBDI has a precat o2. OBDII has pre and post cat. As he is talking about his car, a 95, it would be OBDI, thus being precat only.
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Old 05-31-2004, 04:40 AM   #10 (permalink)
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OBDII was introduced ending 1995, so it could be an OBDII??
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Old 05-31-2004, 06:24 AM   #11 (permalink)
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i'm on the impression that for US BMWs obd II started in 96.
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Old 05-31-2004, 07:12 AM   #12 (permalink)
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1995 m3 = OBD1
1996 m3 =OBD2

i guess 1996 is when obd2 was used
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Old 05-31-2004, 12:11 PM   #13 (permalink)
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All 325s are OBDI.

The displacement was increased to 2.8 due to OBDIIs restrictive nature, and thus, the 328 was born.
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Old 05-31-2004, 04:15 PM   #14 (permalink)
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96 was the year the US required the use of OBDII. Some manufactures introduced it earlier than this. An example: Mercedes started using it in '92.

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Old 05-31-2004, 05:13 PM   #15 (permalink)
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the code did come up as a bad o2 sensor... thanks everyone
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