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E34 (1989 - 1995)

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  #1  
Old 08-15-2014, 09:08 PM
Alpina535I Alpina535I is offline
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Join Date: Mar 2014
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Mein Auto: 1990 BMW 535I
O2

Hey all,

I am needing advice. So I removed the wiring on the old o2 sensor on my 535i 1990 so that I wouldnt have to mess with it on the exhaust due to lack of space. Here is my problem, I can get the o2 remover on the sensor but do not have any room to twist it. That problem is from either side. The hanger right above the o2 sensor with the 4-6 bolts (Have not counted) gets in the way. Should I just unbolt the hanger so that the exhaust drops or is there another way? Thanks in advance. I have been soaking the sensor in PB for the past 3 days.

Alpina
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  #2  
Old 08-19-2014, 12:53 PM
Mr._Graybeard Mr._Graybeard is offline
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Location: Wisconsin
 
Join Date: Oct 2011
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Mein Auto: '95 540i, '87 325ic
Get a six-point 22mm box-end wrench on the sensor and give the wrench a whack with a mallet to force it counterclockwise. If you're using one of those O2 sensor sockets with the slot in the side, they're hard to maneuver in tight spots. Also, they tend to slip because the slot weakens the tool.
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Old 08-19-2014, 06:58 PM
Alpina535I Alpina535I is offline
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Problem is I have a box wrench in 22mm and cant figure out how to get it on the o2 sensor due to the angle is it better to go at it from the front of the car or back or sides? Thanks a ton!
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Old 08-19-2014, 08:08 PM
Mr._Graybeard Mr._Graybeard is offline
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Location: Wisconsin
 
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Mein Auto: '95 540i, '87 325ic
Quote:
Originally Posted by Alpina535I View Post
Problem is I have a box wrench in 22mm and cant figure out how to get it on the o2 sensor due to the angle is it better to go at it from the front of the car or back or sides? Thanks a ton!
Wow, after looking at some pix I have to say that sucker is buried on the 535i. I had no idea. It's much more accessible on my old 633.

I'd get a wrench like this one: http://www.sears.com/stanley-proto-f...4&blockType=G4 ... or you could try a crows-foot flare like this: http://buy1.snapon.com/catalog/item....74852&store=uk

Either way, you should be able to go at it from the side with one of those wrenches.
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