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      11-18-2018, 02:44 PM   #1
Dionysus87
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2008 BMW 135i  [0.00]
Exclamation N55 Lambda Oxygen O2 Sensor DIY?

Hey Everyone,


Really liking this forum, learned a lot about my 135i- I have an issue with the Bank 1 Sensor 1, I have the part, but reading the repair manual it says the following:

Necessary preliminary tasks:
 Remove rear ignition coil cover.  Remove underbody protection
 Remove the catalytic converter.  Remove exhaust system.

Catalytic Converter and entire exhaust system for the pre-cat sensor? There's so many extra steps it might be worth just taking to a shop (hate doing that, plus not sure if they would even go through and tighten everything according to the appropriate torque, steps, etc).

Is this job so complex that most people avoid it? (Hence the non-existent DIY's for the N55 o2 sensors?)
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      11-28-2018, 08:22 AM   #2
amg6975
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Yes, you need to remove the intake and engine cover to unplug the sensors, then remove the downpipe, which is a pain in the ass. You'll probably have to hammer out the studs from the downpipe (that connect it to the exhaust) and replace with bolts as those are almost always rusted solid and you'll either snap them or have to cut them off.

You don't need to remove the whole exhaust.
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      10-19-2020, 09:56 AM   #3
M135ier
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For anyone who comes across this thread, I recently managed to install a new o2 sensor after a couple of unsuccessful tries on my RHD M135i which is pain in the arse due to the steering column being in the way and robbing all the space.
Only way to do it is to use a very long socket extension (think the one I used was a 600mm), a joint socket adapter (to change the angle) and a 22mm o2 sensor socket tool. Once you break it loose just need to undo by hand and fit new one and tighten by hand before giving a bit of a tighten up with the socket tool, extension and ratchet. Torque spec for the 02 sensor is 50Nm. Don't overtighten.

BMW quoted $1086 AUD to replace the pre-cat sensor.
Bought the Bosch part for $135 AUD, o2 socket tool for $27 AUD and I think the 600mm extension socket was $29.99
Crucial tool to getting it done was the extension socket along with the joint socket which most people should already have on hand.
BMW Indy mechanic quoted $250 AUD labour which was going to be my next point of call before coming across the 600mm extension when picking up my new battery. $250 would've been very reasonable to go in from underneath and remove the cat but in the end it only took 15mins to replace with the right tools for the job from above.

Last edited by M135ier; 10-19-2020 at 10:09 AM..
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      03-26-2023, 03:06 PM   #4
TxTygr
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I have found it very difficult to find info on the o2 sensors for my 2013 135is E82, N55 engine (LHD). Recently having received a scan code “P2096” (o2 sensor post cat) and researched online, I have determined there is only a Bank 1, sensor 1 (pre cat) and sensor 2 (post cat) on my car (no bank 2 sensors). Can anyone confirm that? I am contemplating doing this myself and was wondering if the sensors were accessible through the right wheel well? Otherwise, I may try the long extension socket method. Any thoughts? Thanks
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