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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 04-03-2006, 03:32 PM   #21
Custom3
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at what milage should the post-cat be changed?? I change my pre-cat at 50k...great diy by the why
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Old 04-03-2006, 03:37 PM   #22
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Same things for Post O2's 100k

And Thanks
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Old 08-11-2006, 12:21 PM   #23
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I just replaced my rears yesterday. This guide was helpful but I would like to add 1 thing.

When pulling out the old rear ones, I tied a string to the end on the top side, so when I needed to route the new sensors wire back to the top, I just tied it to the string and pulled.
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Old 07-21-2007, 01:10 AM   #24
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excellent diy write up. what a PIA though! btw, i found the post cat o2 (lambda) sensors on realoem.com but cant find the pre-cat senors, ne1 have the part numbers for those?
Post cat:

just found the write up for the pre-cats, thought i would cross-link: http://forum.e46fanatics.com/showthr...=o2+sensor+diy
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Old 10-16-2007, 08:47 PM   #25
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nice DIY
I need to do this soon
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Old 10-30-2007, 01:06 PM   #26
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If I disconnect my pre-cat 02 sensors will this allow me to assess whether my power problems are due to a bad Cat? i.e. if my power problems are solved its the bad reading from the o2 sensors causing a poor air/fuel mix. Will disconnecting the pre-cat 02 sensors allow this?
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Old 11-12-2007, 02:41 PM   #27
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bumpin to remind myself to change these
I think i'll do the precats first then post when im not as lazy
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Old 04-14-2008, 09:13 PM   #28
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Great write up
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Old 05-08-2008, 10:21 AM   #29
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Great write up, very useful but one thing missing.

Error codes refer to bank 1 or bank 2. As I understand it, bank 1 is cylinders 1-3, bank 2 is cylinders 4-6.

Although when you get into the job you can probably work it out (am I right assuming cyl 1 is at the front and cyl 6 at the back ?), it would be really useful if the sensors and connectors in the pictures had been labelled as to which was the bank 1 or bank 2 post-cat sensor and plug. If I get a bank 1 error (P0420 - cat bank 1 below efficiency actually, but the car's passed an emission test in the MOT so I suspect post-cat sensor at fault, not cat) I'd like to know which sensor to look at (so I know in advance whether it's the "easy" one or the "hard" one I'm looking at changing).

Can anyone help with that info ?
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Old 05-19-2008, 12:50 PM   #30
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Vexed !!!

Cheapest price I can find for OEM (post-cat sensors) Bosch part number 0258005109 in UK is: Bosch Direct Fit - (wires 4, cable length 990mm) 71.68 inc VAT & UK deliv. (= $139.55 USD !!!)

That's $80 more, for the same OEM Bosch part that I've seen advertised in the US for $58-$60 !!!

http://www.lambdasensor.com/main/bos...tem=0258005109

http://www.rockauto.com/catalog/rafr...1433864k279826

http://www.autohausaz.com/search/pro...xygen%20Sensor

Can anyone recommend a supplier who will supply at similar prices and ship to UK at a reasonable price ? I'm gonna have to check around the web further too I think.
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Old 05-20-2008, 08:50 AM   #31
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I got mine from KO Performance. 55 bucks each!
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Old 05-20-2008, 11:22 AM   #32
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guys, my car is giving faults:

-AfterCat oxygen sensor short to B+, Cyl #4-6
Peake Research code: 15 9F...I keep getting this code

-AfterCat oxygen sensor disconnection, Cyl #4-6
Peake Research code: 15 D8...I only had this code once



So I am only going to replace the one post-cat O2 sensor, not both.
Is that OK? Or is there some reason I am unaware of that I should do both?

Also Im not sure which sensor is for cyl #1-3 and cyl #4-6. Does anyone know?

Any other advice is appreciated
Thanks for the help!!!!
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Old 05-20-2008, 11:24 AM   #33
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Originally Posted by Cheezemurda View Post
I got mine from KO Performance. 55 bucks each!
Realoem gives me a part number 11781433940, which is $151 from KO.
Even if they'd ship internationally there's no savings to be had for me there.
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Old 05-26-2008, 09:57 AM   #34
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Quote:
Originally Posted by markovnikov5 View Post
guys, my car is giving faults:

-AfterCat oxygen sensor short to B+, Cyl #4-6
Peake Research code: 15 9F...I keep getting this code

-AfterCat oxygen sensor disconnection, Cyl #4-6
Peake Research code: 15 D8...I only had this code once



So I am only going to replace the one post-cat O2 sensor, not both.
Is that OK? Or is there some reason I am unaware of that I should do both?

Also Im not sure which sensor is for cyl #1-3 and cyl #4-6. Does anyone know?

Any other advice is appreciated
Thanks for the help!!!!
Anyone?
Which POST CAT sensor is for cyl #4-6??
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Old 05-27-2008, 07:30 AM   #35
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Superb write up, excellent thread. I thought I'd add a how-to for the other part of the job, if you're changing your sensors you've probably got a fault light which needs clearing. Here's how:
http://forum.e46fanatics.com/showthread.php?t=576850
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Old 06-02-2008, 07:01 PM   #36
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Quote:
Originally Posted by tony325ci_51 View Post
Error codes refer to bank 1 or bank 2. As I understand it, bank 1 is cylinders 1-3, bank 2 is cylinders 4-6.

Although when you get into the job you can probably work it out (am I right assuming cyl 1 is at the front and cyl 6 at the back ?), it would be really useful if the sensors and connectors in the pictures had been labelled as to which was the bank 1 or bank 2 post-cat sensor and plug. If I get a bank 1 error (P0420 - cat bank 1 below efficiency actually, but the car's passed an emission test in the MOT so I suspect post-cat sensor at fault, not cat) I'd like to know which sensor to look at (so I know in advance whether it's the "easy" one or the "hard" one I'm looking at changing).

Can anyone help with that info ?
Quote:
Originally Posted by markovnikov5 View Post
Anyone?
Which POST CAT sensor is for cyl #4-6??
Summer must be here, we had a warm day on Sunday so I got outside under the car and did an oil change.
While I was under there I thought I'd trace the exhaust pipes, finally take some pics and answer this question.

Both post-cat sensors are easy to reach but the Bank 2 sensor (cyl 4-6) will be more fiddly to undo, as the 22mm "sensor socket" (with a slot in it, picture attached) will have to be turned and repositioned just like with a normal spanner. Due to the wires you can't just undo it with a rachet. An open-ended 22mm spanner will be fine for Bank 1 (cyl 1-3) sensor (You couldn't use a "sensor socket" on this, there isn't enough clearance to get a rachet on it.).

(You won't have the advantage of being able to see the view in the 2nd picture. This was taken by holding a small camera in the gap up above the exhaust).

Photos include details of post-cat sensors, and the tools required to replace each:




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Old 06-03-2008, 11:10 AM   #37
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For anyone wanting to download or print this DIY, I made a nice setup for a friend, and figured someone might be interested in this.

Screen shot :


DIY (PDF)
http://www.mediafire.com/?wbehdbbf3px
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Old 06-03-2008, 11:30 AM   #38
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For reference:

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Old 06-03-2008, 12:25 PM   #39
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wow thanks tony, thats great information, just what I needed. thanks to sdbimmer also
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Old 06-26-2008, 10:43 PM   #40
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Quote:
Originally Posted by tony325ci_51 View Post
Great write up, very useful but one thing missing.

Error codes refer to bank 1 or bank 2. As I understand it, bank 1 is cylinders 1-3, bank 2 is cylinders 4-6.

Although when you get into the job you can probably work it out (am I right assuming cyl 1 is at the front and cyl 6 at the back ?), it would be really useful if the sensors and connectors in the pictures had been labelled as to which was the bank 1 or bank 2 post-cat sensor and plug. If I get a bank 1 error (P0420 - cat bank 1 below efficiency actually, but the car's passed an emission test in the MOT so I suspect post-cat sensor at fault, not cat) I'd like to know which sensor to look at (so I know in advance whether it's the "easy" one or the "hard" one I'm looking at changing).

Can anyone help with that info ?

Hey Tony, I have the exact same error on my 03 M3 saying htat efficiency for bank 1 is below threshold. Did you fix your problem and did the light go off? I was just wondering if you could help me out because I'd like to do it myself. Was it a post-cat sensor and did you just have to replace one? Any help would be appreciated. Thanks.
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