Location of post catalyst O2 sensor

K

Kenya

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May 12, 2021
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Dear Friends,
I can not find a post catalytic O2 sensor for my 1997 BMW Z3 M44. If I check OBD scan tool, I saw B1S2 voltage around 0.435 and believe it should be somewhere. I checked the BMW parts manual and Post O2 sensor should be after Catalytic converter. For your reference, I attached the picture for it.
Regards
Kenya
 

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colb

colb

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British Zeds
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Newport, South Wales,UK
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Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
If the sensor is not there then scan tool must be at fault displaying data from somewhere else, maybe BMW INPA would display correctly.
 
K

Kenya

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Thanks! I agree with you. It should be a fault data.

regards
Kenya
 
jonco

jonco

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The M44 Massive
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'98 1.9 Auto
K

Kenya

Regular Member
Joined
May 12, 2021
Points
24
jonco said:
I think the post cat was for US market only due to different emissions regulations. There have been previous posts on this, which I cannot find at moment, but they refer to a real.oem error.
Edit - looks like it has been corrected - part 9 is post-cat and is not included in UK version https://www.realoem.com/bmw/enUS/showparts?id=CH72-EUR---Z3-BMW-Z3 1.9&diagId=18_0307
Click to expand...
Thanks! Mine is Japanese market. Additional question. If I buy a US market catalytic converter, can I just put unused old o2 sensor in a post cat hole?

Regards
Kenya
 
colb

colb

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British Zeds
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Nov 25, 2012
Points
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Location
Newport, South Wales,UK
Model of Z
Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
You would need to put a blanking plug in it, shouldn't think there is wiring on it for a post cat sensor as it wasn't fitted to your model. No point in putting a working sensor in there to do nothing. Blanking plugs available on ebay and Amazon, not sure of the thread size so check you order the correct size.
 
K

Kenya

Regular Member
Joined
May 12, 2021
Points
24
colb said:
You would need to put a blanking plug in it, shouldn't think there is wiring on it for a post cat sensor as it wasn't fitted to your model. No point in putting a working sensor in there to do nothing. Blanking plugs available on ebay and Amazon, not sure of the thread size so check you order the correct size.
Click to expand...
Thanks for your advice! Since I have a faulty O2 sensor, does it work as plug?
 
colb

colb

Zorg Guru (V)
British Zeds
Joined
Nov 25, 2012
Points
178
Location
Newport, South Wales,UK
Model of Z
Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
Yes you could use the bad sensor as a plug you will know its acting as a plug but would confuse a later owner of your car if you sold it when they find an unconnected sensor and no loom wiring for it.
 
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