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Old 09-14-2011, 10:45 PM   #1
TroyAndEddie
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Default P0133 Code: Which O2 Sensor to replace?
Pulled a P0133 code (Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)) before resetting it. Found out it's one of the O2 sensors, but I don't know which one to replace? Is it #7 or #8 in this diagram?

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Old 09-14-2011, 11:11 PM   #2
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Bank 1 sensor one is the pre-cat one. Number 7.
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Old 09-14-2011, 11:52 PM   #3
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I second that. Easy DIY. Just may be tough to break the O2 sensor nut.
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Old 09-15-2011, 12:28 AM   #4
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Though before ordering, make sure all the vacuum lines and intake boot are good. Leaks can cause some 02 codes to be thrown.
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Old 12-09-2012, 09:23 PM   #5
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Are both these O2 sensors the same part #?

I only see 1 type here:

http://www.pelicanparts.com/bmw/cata...EXHmuf_pg2.htm
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Old 12-11-2012, 07:56 AM   #6
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There are several lengths of wires on the sensors depending on Auto vs manual and OBD1 vs OBD 2... I found that my local auto parts store sold the Bosche sensor in their generic box for 1/4 of the cost of BMW...

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Old 12-11-2012, 01:24 PM   #7
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NAPA, Pepboys, Autozone?

How much?
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