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      11-18-2016, 12:30 AM   #1
JiveSoulBro
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DIY 335I N54 Bank 1 sensor 1 (Pre-cat) O2 Sensor Replacement

Changing the front o2 sensor for the 335i N54 is not for the weak at heart, arguably one of the more difficult sensors to change due to its inaccessibility.


Today we are changing the bank 1 sensor 1 only. However, I highly recommend changing both BANK 1 and BANK 2 sensor 1's at the same time.




A couple of the crucial tools that you will need to finish the job properly. Note: You may or may not need more or fewer tools depending on your mechanical skill.
10mm socket
8mm socket
17mm socket
16mm wrench
22mm wrench
Flathead Screwdriver (for prying)
t10 torx
7/8 O2 sensor socket (optional)


[IMG][/IMG]




Start with lifting the car up on JACK STANDS, and remove the Passenger side wheel for easier access.

[IMG][/IMG]



Remove the splash shield using the 8mm socket.

[IMG][/IMG]



Remove the cowl cover for easier access to the pre-cat o2 sensor wire route.

[IMG][/IMG]

[IMG][/IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]



The yellow line represents the route of the BANK 2 Sensor 1.
The orange line represents the route of the BANK 1 Sensor 1.

[IMG][/IMG]


The Black loom is the Bank 1, grey is Bank 2. It wraps behind the valve cover.

[IMG][/IMG]



Time to go under the car.
Now it may sound crazy at first when you are only here to replace the O2 sensor but it must move. You have to remove the 2 bolts that attach the steering rack to the frame.
Place the 16mm wrench on the top nut(stop it from spinning). The bolt is 10mm (odd? yes i know)

[IMG][/IMG]


Moving the steering rack aside, keeping the tie-rods attached to the wheel hubs. This will NOT ruin your alignment don't worry.
Now you have access to the BANK 1 and BANK 2 pre-cat sensors. I recommend using a long 22mm wrench or the 7/8 "box end" style o2 sensor socket.

[IMG][/IMG]



Compare the new to the old to make sure its the correct sensor.
Assembly is the opposite Disassembly.

[IMG][/IMG]



THEN YOU ARE DONE! Not that hard when you do it once. Now you are ready to destroy the Cheap-Class.

[IMG][/IMG]
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      12-12-2016, 04:57 AM   #2
RSKY65
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Excellent DIY! Just out of curiosity though, what was the reason for replacing the sensors?
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      12-13-2016, 02:49 PM   #3
MadeInPhilly
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you can threw codes for the o2 sensor or if the car is running rich.

I did bank 2 few weeks ago. Here are a couple comments

1) You do not need to drop the PS rack. You can unbolt just the passenger side and loosen driver side enough to just slide it out a bit.
2) Use a stubby ratchet with the o2 sensor socket. A stubby 22mm socket will work too. It will break loose.
3) Be careful when you go to route the wiring around the valve cover. I broke one of the clips that holds the o2 sensor wires down. They are fragile.
4) It has been mentioned on the forums. You can use the bank 1 sensor p/n for bank 2 but you will end up with extra harness length that needs to be zip tied up.
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      01-10-2017, 05:56 AM   #4
BashShah
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Quote:
Originally Posted by MadeInPhilly View Post
you can threw codes for the o2 sensor or if the car is running rich.

I did bank 2 few weeks ago. Here are a couple comments

1) You do not need to drop the PS rack. You can unbolt just the passenger side and loosen driver side enough to just slide it out a bit.
2) Use a stubby ratchet with the o2 sensor socket. A stubby 22mm socket will work too. It will break loose.
3) Be careful when you go to route the wiring around the valve cover. I broke one of the clips that holds the o2 sensor wires down. They are fragile.
4) It has been mentioned on the forums. You can use the bank 1 sensor p/n for bank 2 but you will end up with extra harness length that needs to be zip tied up.

Do you by chance know what codes you got?
And do you have a picture of the PS Rack Drop?

Using Carly BMWhat app I have the following codes.
They popped up at the same time, and I drove the car very hard.
No no matter how many times I clear them, they come back as soon as I do a restart.....meaning shut down and restart engine.
The last code worries me....heater.....hmmmm

02c3f DME Internal Error Lambda Probe Bank 1 Chip Analysis
02c40 DME Internal Error Lambda Probe Bank 2 Analysis Chip
02c9c Heater for Lambda Probe Front Catalyst

Any help or input would be greatly appreciated.
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      04-05-2017, 04:39 PM   #5
E92_335ispacegrey
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Quote:
Originally Posted by JiveSoulBro View Post
Changing the front o2 sensor for the 335i N54 is not for the weak at heart, arguably one of the more difficult sensors to change due to its inaccessibility.


Today we are changing the bank 1 sensor 1 only. However, I highly recommend changing both BANK 1 and BANK 2 sensor 1's at the same time.




A couple of the crucial tools that you will need to finish the job properly. Note: You may or may not need more or fewer tools depending on your mechanical skill.
10mm socket
8mm socket
17mm socket
16mm wrench
22mm wrench
Flathead Screwdriver (for prying)
t10 torx
7/8 O2 sensor socket (optional)


[IMG][/IMG]




Start with lifting the car up on JACK STANDS, and remove the Passenger side wheel for easier access.

[IMG][/IMG]



Remove the splash shield using the 8mm socket.

[IMG][/IMG]



Remove the cowl cover for easier access to the pre-cat o2 sensor wire route.

[IMG][/IMG]

[IMG][/IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]



The yellow line represents the route of the BANK 2 Sensor 1.
The orange line represents the route of the BANK 1 Sensor 1.

[IMG][/IMG]


The Black loom is the Bank 1, grey is Bank 2. It wraps behind the valve cover.

[IMG][/IMG]



Time to go under the car.
Now it may sound crazy at first when you are only here to replace the O2 sensor but it must move. You have to remove the 2 bolts that attach the steering rack to the frame.
Place the 16mm wrench on the top nut(stop it from spinning). The bolt is 10mm (odd? yes i know)

[IMG][/IMG]


Moving the steering rack aside, keeping the tie-rods attached to the wheel hubs. This will NOT ruin your alignment don't worry.
Now you have access to the BANK 1 and BANK 2 pre-cat sensors. I recommend using a long 22mm wrench or the 7/8 "box end" style o2 sensor socket.

[IMG][/IMG]



Compare the new to the old to make sure its the correct sensor.
Assembly is the opposite Disassembly.

[IMG][/IMG]



THEN YOU ARE DONE! Not that hard when you do it once. Now you are ready to destroy the Cheap-Class.

[IMG][/IMG]
Can you help me out please , I'm getting a code saying 2c3c lambda probe in front of catalytic converter 2 not plugged, which sensor is that? Like exact location.. thanks in advance..
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      04-20-2017, 12:48 AM   #6
V.I.335is
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Quote:
Originally Posted by E92_335ispacegrey View Post
Can you help me out please , I'm getting a code saying 2c3c lambda probe in front of catalytic converter 2 not plugged, which sensor is that? Like exact location.. thanks in advance..
Self explanatory.. bank 2 front/pre-cat sensor
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      08-23-2017, 01:19 PM   #7
gongshow
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Is anyone else not seeing the Picures in the OP?
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      08-28-2017, 04:15 PM   #8
riso1988
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Quote:
Originally Posted by gongshow View Post
Is anyone else not seeing the Picures in the OP?
same problem, any chance there's a PDF of this somewhere or photos can be re-hosted? Thanks
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      09-11-2017, 06:33 PM   #9
suchaguy55
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Test for membership

Trying to get pictures to appear so have to post.
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      06-29-2018, 04:07 PM   #10
GxTwo
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I've failed on 2 attempts at doing this

First time i had a large 22mm spanner that wouldn't fit becuase of the clip next to the sensor.

I then bought a these:



I can't get the wrench to seat because of the steering rack and i can't get the sockets to seat because the ratchet keeps moving. I almost had it stuck due the the angle at one point

What's the best way to get at the top nut for the steering rack? I had a feel about today and it seems like it's going to be a b**ch!

I WILL get this done!
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