Bad O2 Sensor - 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 02-22-2005, 12:52 PM
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Hello,
this question is actually on behalf of my friend's VW Beetle. Her O2 sensor has failed according to her check engine light code. The problem is: she has 2 O2 sensors, one before the catalytic converter, one after. How do you determine which one is failing? is there a way to use a voltmeter? I need some in depth instructions if that's the case because I SUCK when it comes to electrical stuff. Thanks
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#2 (permalink) Old 02-22-2005, 12:56 PM
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umm go to a vw website man. sorry

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#3 (permalink) Old 02-22-2005, 01:20 PM
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nobody knows how to determine which O2 sensor is bad? I mean...this isn't a VW question, it's a O2 sensor question. I think our E36's only have one between the headers and the cat conv. but...the fact that it's on a VW is totally besides the point.
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#4 (permalink) Old 02-22-2005, 01:33 PM
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My money is on the O2 sensor before the cat. Don't know how to be sure tho.

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#5 (permalink) Old 02-22-2005, 01:37 PM
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usually by looking at the sensor itself.. if it's black and gross, then it needs to be changed.

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#6 (permalink) Old 02-22-2005, 05:55 PM
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the check engine code should tell you. get an OBDII reader.


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