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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 02-04-2005, 12:35 PM   #1 (permalink)
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Hi guys,

Everywhere I look on the tech data they are telling me that I have 4 O2 sensors on the car. I have confirmed that the O2 sensor is causing my check engine light. Under the car I only can locate 2 sensors, 1 in the first bank(cylinders 1 thru 3) located right before the converter, the 2 one is right behind the converter. #1 has the shorter harness, #2 has the longer harness. I cannot locate anymore sensors. I don't have the tech manual on the car yet and I can't find any pics on the web as far as location of O2 sensors on the car. Can you guys help me out?

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Old 02-04-2005, 12:41 PM   #2 (permalink)
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first off what year car do you have?
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Old 02-04-2005, 12:41 PM   #3 (permalink)
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1998
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Old 02-04-2005, 01:11 PM   #4 (permalink)
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they're on your exaust headers.. both of them
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Old 02-04-2005, 01:22 PM   #5 (permalink)
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I looked on both headers. towards the bottom end of each header I saw a hole with a bolt in each of them. Like they were capped off. No sensor to either one of them. Where exactly on the headers would they be?
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Old 02-04-2005, 01:59 PM   #6 (permalink)
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The bolts look factory. There are no wires in the area or harnesses.
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Old 02-04-2005, 02:01 PM   #7 (permalink)
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well then someone plugged your holes.. that's where they're supposed to be unless someone did some sort of obd conversion.. like I have an obd2 engine but I had to plus those holes when I converted to obd1...
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Old 02-04-2005, 02:12 PM   #8 (permalink)
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YOu should be able to see them, unless the holes have been plugged for some reason as said above. Two sensors are positioned prior to the cat, the other two are on the other side of it.
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