Rear o2 sensor pre-cat access

MadeInPhilly · 11-27-2016, 11:20 AM

How do people get to this? Seems like only way I can even get a wrench or o2 socket on it is right after the PS rack.

Jeef · 11-27-2016, 11:30 AM

Take the downpipe out.

amrazM · 11-27-2016, 11:50 AM

stubby 22mm wrench, break it loose then unscrew by hand.

ferocity02 · 11-27-2016, 02:41 PM

If you get the right angle a regular 22mm wrench in there to break it loose. You can unbolt the steering rack and shift it forward to get a little more room to get your arm in there.

RSL · 11-27-2016, 02:44 PM

Quote:

Originally Posted by MadeInPhilly

How do people get to this? Seems like only way I can even get a wrench or o2 socket on it is right after the PS rack.

Yep. Remove the passenger side bolt on the steering rack and loosen the driver side bolt. That will allow the rack to move forward a few inches on the passenger side to give you room. Remove the heat shield above the rack on the passenger side.

I use a standard 3/8" ratchet with an offset O2 socket to break them loose and then unthread by hand, as stated.

mweisdorfer · 11-28-2016, 07:09 AM

Quote:

Originally Posted by MadeInPhilly

How do people get to this? Seems like only way I can even get a wrench or o2 socket on it is right after the PS rack.

There is a DIY in this fine recently on this forum.

MadeInPhilly · 11-28-2016, 09:08 AM

thanks for the feedback guys. i'll give it a try tonight. Prob try sticking my hand in there first without unbolting the PS rack.

musa · 11-28-2016, 11:28 AM

Quote:

Originally Posted by MadeInPhilly

thanks for the feedback guys. i'll give it a try tonight. Prob try sticking my hand in there first without unbolting the PS rack.

You will struggle for hours if you don't unbolt the PS rack a bit - it won't affect your alignment. Someone already posted a DIY for this:

http://www.e90post.com/forums/showth...ight=o2+sensor

MadeInPhilly · 11-28-2016, 01:18 PM

musa, you da man. Forgot to look in the DIY section. I did do a search but looks like the OP of that did the install recently. will report back later tonight after the install.

MadeInPhilly · 11-28-2016, 07:55 PM

so I just got done putting in the new sensor. I did remove the passenger side bolt for the PS rack even with that i got big forearms so it was a PITA. Routing the new cable around the back of the engine was a pain also. Broke one of the harness clips.

I got rid of the O2 sensor code but now I have misfire codes in cyl 4,5,6. Next is new spark plugs.

11-27-2016, 11:20 AM	#1
MadeInPhilly First Lieutenant 44 Rep 301 Posts Drives: E30 318is, E90 335i, 03 GTI Join Date: Sep 2009 Location: Dallas, TX iTrader: (0)	Rear o2 sensor pre-cat access How do people get to this? Seems like only way I can even get a wrench or o2 socket on it is right after the PS rack. Attached Images
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11-27-2016, 11:30 AM	#2
Jeef Lieutenant Colonel 391 Rep 1,943 Posts Drives: AW E92 335i Join Date: Nov 2008 Location: San Diego, CA iTrader: (6)	Take the downpipe out.
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11-27-2016, 11:50 AM	#3
amrazM mTekMods 2279 Rep 3,014 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	stubby 22mm wrench, break it loose then unscrew by hand. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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11-27-2016, 02:41 PM	#4
ferocity02 Colonel 553 Rep 2,085 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	If you get the right angle a regular 22mm wrench in there to break it loose. You can unbolt the steering rack and shift it forward to get a little more room to get your arm in there. __________________ 2013 135is DCT Carbon Black Metallic
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11-28-2016, 09:08 AM	#7
MadeInPhilly First Lieutenant 44 Rep 301 Posts Drives: E30 318is, E90 335i, 03 GTI Join Date: Sep 2009 Location: Dallas, TX iTrader: (0)	thanks for the feedback guys. i'll give it a try tonight. Prob try sticking my hand in there first without unbolting the PS rack.
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11-28-2016, 01:18 PM	#9
MadeInPhilly First Lieutenant 44 Rep 301 Posts Drives: E30 318is, E90 335i, 03 GTI Join Date: Sep 2009 Location: Dallas, TX iTrader: (0)	musa, you da man. Forgot to look in the DIY section. I did do a search but looks like the OP of that did the install recently. will report back later tonight after the install.
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11-28-2016, 07:55 PM	#10
MadeInPhilly First Lieutenant 44 Rep 301 Posts Drives: E30 318is, E90 335i, 03 GTI Join Date: Sep 2009 Location: Dallas, TX iTrader: (0)	so I just got done putting in the new sensor. I did remove the passenger side bolt for the PS rack even with that i got big forearms so it was a PITA. Routing the new cable around the back of the engine was a pain also. Broke one of the harness clips. I got rid of the O2 sensor code but now I have misfire codes in cyl 4,5,6. Next is new spark plugs.
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