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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 08-29-2004, 07:40 PM   #1 (permalink)
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hi all can any one tell me what a bad o2 senor does and how to tell if it is bad
thank you
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Old 08-29-2004, 07:41 PM   #2 (permalink)
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CEL
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Old 08-29-2004, 09:22 PM   #3 (permalink)
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usually it throws a CEL...if not you get crappy gas mileage and your exhaust has a stronger smell of gas to it
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Old 08-29-2004, 09:38 PM   #4 (permalink)
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i get crappy gas mileage anyways like 18-20 in my 325is
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Old 08-29-2004, 09:51 PM   #5 (permalink)
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One of the key signs your gonna see if you drop a O2 sensor.. would have to be a very very rough idle.. and horrible gas mileage...

Les
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Old 08-29-2004, 11:13 PM   #6 (permalink)
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any associated check engine light? cruise control not working? fuel running rich?
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Old 08-30-2004, 08:39 AM   #7 (permalink)
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Quote:
Originally posted by okczy21@Aug 29 2004, 10:18 PM
i get crappy gas mileage anyways like 18-20 in my 325is
wow do you know why it's so low? 2 comments on that I know I have a 4 banger but I get like 26-28 and I drive it hard, and if you thinks thats really bad I drove a '96 Land Rover Discovery all time 4 wheel drive just a huge a$s box it got 12 MILES TO THE GALLON! 12!!!

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Old 08-30-2004, 08:44 AM   #8 (permalink)
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Ok yes.. you will .. or should (if its working right) get a check engine light when your O2 sensor fails... gas mileage.. and just a rather bumpy idle... are some other problems you get when you lose a O2 sensor

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