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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Nov-01-2007, 04:19:11 PM   #1
kkamakasi
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Default Bank 2 Post-Cat O2 sensor. How do i get there?

mikiyu suggested that I follow his header diy and try to access it by taking out the bank 1 headers then taking section 1 off and wiggle myself into where the bank2 postcat O2 is. Is this the only way? Any easier ways to replace this O2 sensor?
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Old Thu, Nov-01-2007, 06:39:43 PM   #2
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QUOTE=kkamakasi;2557540]mikiyu suggested that I follow his header diy and try to access it by taking out the bank 1 headers then taking section 1 off and wiggle myself into where the bank2 postcat O2 is. Is this the only way? Any easier ways to replace this O2 sensor?[/QUOTE]

You can take off the skid plate underneath the vehicle. You can access it that way.
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Old Thu, Nov-01-2007, 06:47:32 PM   #3
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Quote:
Originally Posted by kiloil View Post
QUOTE=kkamakasi;2557540]You can take off the skid plate underneath the vehicle. You can access it that way.
yeah, there are no easy way to access the bank 2 post cat O2 sensor. you can try taking off the "skid plate" AKA reinforcement plate and try to nudge your wrench around the exhaust to gain access.

do remember to mark the location of the bolts on the reinforcement plate and line up the bolts with the marking on install and jack up the car evenly on both sides. do not move the car once reinforcement plate is off to prevent throwing off the alignment
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Old Thu, Nov-01-2007, 07:59:45 PM   #4
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Originally Posted by mikymu View Post
yeah, there are no easy way to access the bank 2 post cat O2 sensor. you can try taking off the "skid plate" AKA reinforcement plate and try to nudge your wrench around the exhaust to gain access.

do remember to mark the location of the bolts on the reinforcement plate and line up the bolts with the marking on install and jack up the car evenly on both sides. do not move the car once reinforcement plate is off to prevent throwing off the alignment
I didn't mark the skid plate bolts when doing my headers installation and the car seems to drive fine. I'll keep an eye out for uneven tire wear.
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Old Fri, Nov-02-2007, 08:51:21 PM   #5
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cool...i think i'll try to wedge my wrench in there from underneath the car.
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Old Tue, Aug-12-2014, 10:11:18 PM   #6
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Default Re: Bank 2 Post-Cat O2 sensor. How do i get there?

Just want to update this for other members' future reference.

I just replaced all four o2 sensors and these are my experiences with the process:

Remove the reinforcement plate. Access to the o2 sensors is way easier (including Bank 1, pre-cat), working from below is easier too. Just be sure to have your car up on jack stands prior to removing the plate. I'm sure both pre-cat sensors are accessible topside but there's definitely more space from below (still not a lot, but sufficient).

Regarding Bank 2, Post-cat (which the OP specifically asks about), unless you have a very thin walled AND tall crows foot 22mm wrench, the flange from section 1 will not allow the o2 wrench to slip over the o2 sensor, and if it did unless it was a tall wrench the foot of the crows foot wrench will hit the exhaust pipe and not allow it to turn.

I had to:
- Remove reinforcement plate (which I did anyways for the other o2 sensors).
- Remove nuts holding Bank 1 header to cylinder head (cyl. 1-3).
- Remove nuts/bolts between headers and section 1 (for both bank 1 and 2).

This sucks, and it's tedious, but I found it necessary so I could wiggle section 1 and header apart just enough to fit the crows-foot wrench and have clearance to turn it.

Note: you'll want the crows foot o2 wrench, universal joints for your sockets, various extensions, breaker bar, various sockets (tall and reg), and lots of patience. Going fairly slowly it's taken most of the day.

This is a great forum, with fantastic resources. Many thanks to all the contributors.

I used two links that dafoe posted in another thread (post 290) to header removal/install for the majority of the steps:

Quote:
Originally Posted by dafoe View Post
Here ya go bro! Hit me up if you run into any issues...

http://www.m3forum.net/m3forum/showthread.php?t=351220

And this is the one that Mikymu deleted, but a great member copied all the data... hehe! But the one above is better! Use them both, and let us know how it goes.

http://www.m3forum.net/m3forum/showt...stall+diy+m3an
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Discussing Bank 2 Post-Cat O2 sensor. How do i get there? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)