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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-14-2013, 11:20 AM
Mason_E39 Mason_E39 is offline
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Post Cat o2 sensors Help.

Hey Everyone,

I have a 2001 530i. My post cat o2 sensors went out on me a little bit ago(3 months). I went to Autozone for replacements and just got the Bosch sensors. BUT here is my issue, when I was installing them I noticed one threaded in perfectly in one exhaust tube but in the other, it seemed like the sensor didnt wanna thread in correctly. So I assumed that maybe a sensor got mixed up in the boxes because both part numbers were the same. But no, the numbers on the sensors were the same.

My question is: Are both post cat o2 sensors the same thread pattern or is one different from the other?

I highly suspect that Autozone is wrong because it seems like each exhaust tube has a different thread pattern meaning. One looks like straight threads while the other looks chamfered.

Thanks
Josh
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  #2  
Old 05-14-2013, 11:41 AM
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Fudman Fudman is offline
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Replacing post cat O2 sensors is unnecessary. Save your $$. Just put your old one back in and return the new one to Autozone.
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  #3  
Old 05-14-2013, 11:48 AM
Mason_E39 Mason_E39 is offline
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Quote:
Originally Posted by Fudman View Post
Replacing post cat O2 sensors is unnecessary. Save your $$. Just put your old one back in and return the new one to Autozone.

I had no choice, the original sensors went out...
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  #4  
Old 05-14-2013, 11:51 AM
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aa240sx aa240sx is offline
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I could be wrong here, but I think Fudman is assuming that your post cat sensors are bad, but that you could put them back in anyway with no ill effect. I've read some threads here that discuss a DIY 'bypass' option for this sensor.
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  #5  
Old 05-14-2013, 12:00 PM
Mason_E39 Mason_E39 is offline
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Guys thank you for your input and offering your advice.

BUT

I purchased the car used and it didnt have the original o2 sensors so I am going from a worn out crappy brand to a new worn out crappy brand.

We all know used original is better than new "made in china" junk. Everyone knows that. But for now this is what I have to work with. They arent hard to replace and this isnt my daily so I am not worried.

I will establish my question again. Are both bank post cat o2 sensors same thread or are each bank individual thread patterns?


Thanks
Josh
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Old 05-14-2013, 12:33 PM
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16valex 16valex is offline
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Quote:
I will establish my question again. Are both bank post cat o2 sensors same thread or are each bank individual thread patterns?
They both have the same thread.
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  #7  
Old 05-14-2013, 12:36 PM
Mason_E39 Mason_E39 is offline
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Originally Posted by 16valex View Post
They both have the same thread.
I was hoping they were different.

I guess whoever replaced them before me stripped the threads.

Thanks for your input!

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Old 05-14-2013, 12:48 PM
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16valex 16valex is offline
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Quote:
Originally Posted by Mason_E39 View Post
I was hoping they were different.

I guess whoever replaced them before me stripped the threads.

Thanks for your input!

That's a bummer man! But what you can do is try to chase the thread out with a thread chaser, I think it's the same as some spark plug chaser, you can buy this at any auto parts store, make sure your bring the O2 sensor with you to compare.
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Old 05-14-2013, 12:53 PM
Mason_E39 Mason_E39 is offline
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Quote:
Originally Posted by 16valex View Post
That's a bummer man! But what you can do is try to chase the thread out with a thread chaser, I think it's the same as some spark plug chaser, you can buy this at any auto parts store, make sure your bring the O2 sensor with you to compare.
I was thinking about doing that but by the looks of it. Theirs not enough material in the thread to make enough new thread if that makes any sense. Looks like ill be shopping for new headers.
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Old 05-14-2013, 01:29 PM
edjack edjack is offline
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The part numbers on the sensors s/b the same. Take the car to a muffler shop and have a new bung installed.
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Old 05-14-2013, 01:53 PM
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16valex 16valex is offline
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Quote:
Originally Posted by Mason_E39 View Post
I was thinking about doing that but by the looks of it. Theirs not enough material in the thread to make enough new thread if that makes any sense. Looks like ill be shopping for new headers.
Here is your answer below.

Quote:
The part numbers on the sensors s/b the same. Take the car to a muffler shop and have a new bung installed.
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  #12  
Old 05-14-2013, 01:58 PM
Mason_E39 Mason_E39 is offline
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Quote:
Originally Posted by 16valex View Post
Here is your answer below.
I never thought they could do that.

THANK YOU SO MUCH!
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