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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-19-2009, 07:33 AM
maurice ring maurice ring is offline
maurice
Location: North Carolina
 
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Mein Auto: 2001 330 ci bmw
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Downstream oxygen sensor heater bank 2 sensor 2 where is this sensor located anybody know thanks
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  #2  
Old 03-19-2009, 08:05 AM
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Goldman Sachs Goldman Sachs is offline
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The O2 sensors have heaters built in them because it won't read right when cold. That being said, it looks like one (bank 2) of your post cat sensor's heater is shot. You will most likely need to replace it which is the harder one to do. That sucks.
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Old 03-19-2009, 09:31 AM
maurice ring maurice ring is offline
maurice
Location: North Carolina
 
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Well when you say harder .tight working conditions. you dont have to remove any sub assy. do you .and when i went to look for the part it said quantity 2 is this correct there are two back there too replace?Will that o2 scocket fit back there or do you have to get a special tool or will a 22mm wrench work . I have a few of them I could always modify it to work.
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Old 03-19-2009, 10:46 AM
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Goldman Sachs Goldman Sachs is offline
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If you read through the diy, its described as hard to get at. They are located on the bottom of your car under a panel with wires that you have to run. Its not impossible or anything, just much harder than the pre cats. I haven't replaced them because you don't need to unless you get a code. They don't affect your performance only emissions. There are two down there, and you might as well replace both because I doubt you wanna do it twice.

Here's the diy (it looks like the pics embedded have over run the bandwidth allowed though )
http://forum.e46fanatics.com/showthread.php?t=293116
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Last edited by Goldman Sachs; 03-19-2009 at 10:48 AM.
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Old 03-20-2009, 05:43 AM
maurice ring maurice ring is offline
maurice
Location: North Carolina
 
Join Date: Oct 2007
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Ok thank you very much and i will replace them both.I did look at the DIY and was still unsure just wanted to be sure before i got started...This is the best web site .You and eveyone has been so helpfull. thanks again
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