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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Post cat O2 sensor's.



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      04-01-2017, 07:20 PM   #1
fedorE90
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Post cat O2 sensor's.

I am having a hard time figuring out how to replace the gray sensor. I can get my wrench on it and loosen it but i don't see a way of removing it and installing a new one easily. This is the post cat sensor.
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      04-02-2017, 12:01 PM   #2
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I am having a hard time figuring out how to replace the gray sensor. I can get my wrench on it and loosen it but i don't see a way of removing it and installing a new one easily. This is the post cat sensor.
Are your post cat sensors blowing codes ?
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      04-02-2017, 12:11 PM   #3
fedorE90
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Are your post cat sensors blowing codes ?
Yes, after DPs install.
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      04-02-2017, 12:13 PM   #4
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Are your post cat sensors blowing codes ?
Yes, after DPs install.
Do you have a tune like MHD?
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      04-03-2017, 11:07 AM   #5
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Wrong section.
But I think you need a DP cat fix to fix your errors.
Not sure what that is but it can save without O2 sensor replacement.
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      04-04-2017, 04:26 PM   #6
fedorE90
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Sorry if this is a wrong section. I thought DIY will be the best place to ask.

Also these codes (2C7B) are not normal DP codes that we get. This is a bad sensor. After talking to a few people they said that both post cat O2's can be removed W/O removing the DP's. I got to one but second one seems hard to reach. Maybe its the way my DP's are positioned.
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