How I Diagnosed My Failed Oxygen (Air Fuel Ratio) Sensor - BMW DIY

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In this video I show you how I was able to diagnose my bad O2 sensor . I have a 2008 BMW 335i with the N54 twin turbo inline 6 cylinder engine. It turned out to be bank 2 sensor 1 that was bad. I had a number of random misfire codes and mixture codes but nothing specifically pointing to a bad oxygen sensor.
If you think you might have a bad sensor but aren't sure what signs to look out for before the sensor completely fails this video should be helpful.
If you have a BMW 335i and need a sensor you can buy one here (it helps the channel):
Bank 1 Upstream:
bit.ly/2WXaD9l
Bank 2 Upstream:
bit.ly/2ticRCG
Bank 1 Downstream:
bit.ly/2UP6r9T
Bank 2 Downstream:
bit.ly/2tdIi12
If you have a BMW and want to setup the software shown on my laptop:
We are using the INPA software suite to code the injectors.
Link to a thread showing how to setup INPA/NCS Expert:
www.e90post.com...
If you have Windows 10 64-Bit:
www.e90post.com...
You can find the INPA cable online at places such as Amazon or Ebay. Search INPA Cable K+D Can. When you see the word "affiliate" listed beside any link in my description please know that this is a custom link and I will earn a small commission if you opt to purchase using said link. This is at no extra cost to you so it's a win all around :) Thank you!

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3 окт 2024

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Комментарии : 235

@stonesthrow420 4 года назад

My 2003 X5 has the 3 litre M54 engine, and this completely explains what is going on with my rough idle.....new plugs, new coils, new MAF, new gaskets...etc. No vacuum leaks. After a good quick drive on the freeway, engine is good and warmed up, runs like a new vehicle...goes into closed loop at idle, runs like garbage with misfire codes and fuel trim codes. Im gonna change out bank two O2 sensor immediately! Thanks for the great video...it helps people understand how o2 sensors work, and the purpose of closed loop on a modern fuel injection system. BRAVO

@micraw714 5 лет назад

You always seem to post videos at the appropriate time when I'm having the exact same issues with mine brother 😁

@Mercury_EG 5 лет назад

truth

@victorc1611 5 лет назад

I second that.

@chukachuka17 2 месяца назад

Exactly what I'm experiencing. Lean mixture bank 2. Now having misfire bank 2. Have done a smoke test. No leaks. I will change my O2 sensor. But let me look at the readings first. Thanks a lot. This is life saving.

@alcetus3 3 года назад

I just fixed my misfires and limp mode because of this video. thank you for this awesome informative video. When first startup, running real rich, clear codes and ran fine until i got into the power band at WOT. then got o2 sensor errors, and misfires. Love your videos. (2008 335i, 112,000 miles. FBO except still running stock intercooler, MHD BEF, JB4 piggy back tune map 2 mostly)

@LuanNguyen-rm3pb 4 года назад

Thank you so much for your tutorial video. It's really excellent. I bought a 2013 BMW 328i xDrive N20 4 Cyl in Dec 2019. It had drivetrain malfunction and misfire on Cyl 2. The dealer suggested to replace 4 coils & spark plugs. I replaced the 4 coils and 4 spark plugs, and the battery (was low). The drivetrain mal function error went away, but the misfire error persisted. I replaced the fuel injector (looked black) on Cyl 2 to no avail. Yesterday, I cleaned the MAF (look new and clean to begin) to no avail. Your video suggested my car may have O2 sensor issue. I will give it a run and checked the 4 spark plugs as you did to confirm the black sud on #2; I may have more than 1 Cyl misfire. I think my car may not have bank 1 and 2 as your N54. Much thanks to any suggestions you may have. Thanks again. This video is really excellent.

@semperer 7 месяцев назад

Thank you for the video I just found out that owner before put Diesel lambda sensors into the 335i N54..... thats crazy... and this crap from exhaust proved that my car is running rich

3 года назад

I have a Mercedes W203 that was smoking a lot. I had no idea what to do. Thanks man. You saved my life (and my pocket).

@Ashdowne9 Год назад

DANG!!! This was EXACTLY what I needed. Wow. Thank you SO much for this fantastic descriptive video. Now I know exactly what my problem is. I'm very excited to fix it now! Thank you !!!

@davidgarry2687 5 лет назад

Hands down the best DIY n54 videos on RU-vid! Extremely detailed and well explained. Thank you so much for the education!!

@pochron1105 3 года назад

Worth adding that on a cold engine [O2 sensor not heated up] and during hard acceleration[O2 sensor too slow for what you try to do], it's the mass airflow sensor that takes over, so that lambda values can be estimated/guesstimated from the lookup data.

@SL9SH Год назад

There are no crap MAFs on an N54, just MAP

@fasnaeem6678 4 года назад

As always keep up the great and informative videos making owning my N54 a lot less stressful and daunting and encouraging me more and more to work on it myself!

@friguy4444 4 года назад

You.....ROCK!!!!! LOL. I can't tell you how much you've helped me with this video. Thank you so much. It seems like no one talks about the importance and or effects the O2 sensors have on our cars. I have an E46 M3 and I just changed out my OEM Catted Headers for a set of catless ones and I have had a real problem with the car having codes on the O2 sensors as well as many other codes just coming up even after I've done a tune that is supposed to adjust the sensors for that particular set up. Miss fire codes and strange stuff. Exactly what you have described and shown here. You were so thorough and I am so glad. I am having the miss fire codes just like you had on bank 2 but only on bank 1 cylinders. (Cylinders 1&2) indicating it is likely the O2 sensor on that bank (as you similarly showed) that is the culprit. It has shown a couple of times where both pre cat sensors are throwing codes. But usually it's only showing a code for the pre cat sensor on only bank 1. I have been thinking that it could be so many things that I just wasn't sure enough yet to pop for any one or two parts to try and solve it. I thought maybe vacuum or ground problems. But I'm sure enough now to start with this. Thank you again!

@libotean28 3 года назад

Damn, i thought it would be an expensive 2021 but you just saved me hella money since BMW said it was my Injectors! Thanks a lot for the video and for sharing your knowledge.

@Centralcoastwraps831 3 года назад

Same here bro im like huh hold on wait a second 🤔🤔🤔🤔 bmw out here robbing us

@matthewweisdorfer7757 5 лет назад

I have replaced all of my o2 sensors on my N54. The pre-cats I did at 120k proactively. The post cats, I got a specific code. The post cats really don’t do much other than monitor the pre-cats and make sure they are running correctly. You can also monitor them live on a scanner. The scanner should have specific values. If values aren’t what they should be, then you know what specific O2 sensor is bad. Easiest thing to do is take the cats out of the car if you are looking to change them out. They are a PITA otherwise.

@DRNLR 2 года назад

Thanks for the detailed info on how to change the spark plugs. The steering rack removal was the key to this DIY. I bought the exact socket from FCP euro and it made the spark plugs much easier to deal with.

@danteruiz4356 4 года назад

uuu god i love you man... like the best teacher ever, i have exactly the same problem, but not the same tools :( ... but now i know what to do thanks to you... greetings from Chile!!!!

@Locustandhoney 11 месяцев назад

Thank you for your good service to humanity!

@samuelwilliams7331 Год назад

Love the education you give out. This is on my todo list.

@aliyildirim7992 2 года назад

I swear i love people like you who , i have i think the same problem at 325i 2008 n53 now bc i saw this video and i remember when i changed my sparkplugs and coils and i saw some of them was so dirty and some of them „clean“ like yours , i want to repair by myself what i can because here in Swiss if you go to a service they take to much for nothing and i hate it, but that s the reason exist people like you and youtube to try if we have enough time and we want this to try, big love man P.s from where can i order a usb odb2 cable? Im not the best in cars or repairs but i want to handle what i have , thank you

@superspeeder Год назад

Going through the same on a 2011 N52 right now. Original sensors with 200k kms (~130k miles), no codes set, unplugging the sensors brings back midrange torque and improved drive ability and fuel mileage. I thought it was a DISA valve issue, glad I checked O2 sensors first! I just assumed they were ok because no codes were set. OEMs recommend replacing O2 sensors by 100k miles, now I know why.

@Mercury_EG 5 лет назад

Really happy I stumbled across this, I grabbed up a used BMW and it has the rough idle, as soon as I figured out it was about 30 seconds to a minute I instantly though heater, but since I am not familiar with BMW I figured it couldnt be that simple right? Well I will run this test in the am, and am doing a full drain and replacing everything anyways, just add the o2 sensor to the list

@scottxp800 5 лет назад

Full blown misfire mode sets a code and turns off the injector for that cylinder until the next restart. It will try on restart to run the misfiring cylinder again but will again turn off the fuel injector if the cylinder is still misfiring. It was running rough but it was not in full blown misfire mode...

@markt9438 4 года назад

Best and easiest Explained Lucy ! LOL

@tronn_carter 2 года назад

I thought maybe it was leaky injectors but decided to do a bit more research before buying parts. glad I found this video. mine is running soo rich. crazy fuel smell and white smoke. thought it was leaky index 12s will be changing these sensors, installing new coils and cleaning my plugs as the have less than 100 miles. changed them chasing a misfire issue. only 95k on motor and 106k on chassis

@brycemacinnis512 Год назад

What was your fix?

@Itisinthehand 4 года назад

Have 630i n53, but there was loads of good stuff here to help me tackle mine.Thanks for uploading. Great.

@zoober2217 5 лет назад

I follow and another N54 content channels, but this channel is different! This is better! Absolutely useful DIY's!

@louiecabadas812 Год назад

Good video and accurate information. Don’t stop making these types of videos bro

@LuisGarcia-ye9gy 2 года назад

Good video bro It helps alot i have a audi s4 and couldnt figure out why it was misfiring i changed alot of stuff still the same. Next its the 02 sensors. Has all this syptoms Thank you! 👍

@4037joel 5 лет назад

Wow, ive been driving without 1 o2 sensor for around a year now since i put my DPs on. No wonder i have the same symptoms as yours.

@markt9438 3 года назад

I can breathe now even with the garage door closed lol crazy dude

@aldodelgado5477 Год назад

Great!!! I’ll swap mine tomorrow see if that works since I only get a misfire on 2 and it goes away only when I erase the core

@lucasnl9882 5 лет назад

Thanks for the information. Now I know how to check for bad lambda sensors.

@HumbertoBenavidesphotographer 5 лет назад

As always, very nice info and videos from you !

@timkane1185 5 лет назад

Great video! I’m getting lean codes on my e92, so very timely. Thanks!

@jessicaandtrains7768 Год назад

Really great video. I need to check this on mine tomorrow

@_zz__Z 3 года назад

Wow! Thank you, I have this issue... I appreciate this.

@SKWDMDYT 5 лет назад

Thanks for the tutorial. Very well done.

@BMWPROGRAMMINGJAMAICA 5 лет назад

Thanks Bro

@ncsuche888 5 лет назад

one of the best BMW N54 DIYer! look forward to seeing new video. BTW, will the post cat sensor be easier to change?

@VehicularDIY 5 лет назад

They are slightly easier to get to, the bank 2 sensor 2 sensor is actually pretty easy to access from under the car.

@blackhammer6948 2 года назад

@@VehicularDIY I currently have all new o2 sensors and am going to put in soon and I was curious to know if I have to reset any adaptations or will the ecu just automatically dial in everything after replacing all o2 sensors

@stephanelouvet1113 Год назад

Awesome troubleshooting help ! Thank you !

@mohe81 Год назад

These air filters are positioned perfectly xD

@LALOTEH 2 года назад

You may have saved me money I was about to order a new set of Delphi coils and 1 step colder spark plugz from fcp my car is running like yours at 2:47 😰 So ima get to ordering the O2 sensors and how to change one on my own

@BMWI-gk9wh 4 года назад

Fyi to save some money the o2 sensors are the same along as you get 2 rear ones (2 extra long ones will work but wont work viseversa... meaning two short ones obviously wont work and would cost way more for the short one vs long one meaning bank 1 vs 2 )

@robhughes8516 5 лет назад

Nice diy, thanks for the info and walkthrough!

@BMWPROGRAMMINGJAMAICA 5 лет назад

Thanks Bro

@ruan800 2 года назад

Amazing video, great explanation, Thanks!

@sadiel1 3 года назад

thank you sir very detailed video and easy to understand

@soburnedout 3 года назад

You mention using your affiliate link for purchases- and I’d LIKE to as you’ve been a great help to me and others, but I don’t see one for the “INPA K+D Can” cable. Please send or reply with the link because I’m about to start loading a dedicated laptop and will want to have the cable by the time the software is ready. Thanks for everything

@yaghiyahbrenner8902 2 года назад

This is such a great video. thank you.

@nickolascain2994 5 лет назад

informative as always! Thanks for the helpful info.

@JohnSmith-dp3cx Месяц назад

If there is an intake leak your O2 sensor will not run same as the other bank. Did you check for air leak prior to comparing bank 1 to bank 2?

@Random.Adventures. 3 года назад

thank you for the detailed information

@ademc8872 2 года назад

If you looked at lambdawert katalysator bank 2, you wouldve seen it was way out of whack. Excellent video as always!

@nadirnazim9342 3 года назад

I started my car cold and engine started shaking right away. I hooked up a code reader and saw cyl 4,5,6 misfire. I let the car running for a bit more and then started seeing the o2 sensor code. So is it my o2 sensor or something else? When I clear code, I do feel that the engine smooths out for a few seconds.

@kevinfan2260 5 лет назад

Always helpful. Many thanks!

@misterp4047 4 года назад

You have MHD so you can see olso that bank 1 or 2 measure and if you monitor you can see in "graph a log" than is doing nothing it doesn't respons

@jlindborg1105 Год назад

Hi! I actually have the same problem on Bank 2 but I get low voltage values so the engine thinks it runs rich in bank 2. But it gets a little better when the engine has warmed up but still noticeable lower voltages than bank 1. I haven't checked the spark plugs yet but i will. I have the N53.

@aidankambeitz6788 4 года назад

Video helped me a ton thank you!

@cryptobeak5108 5 месяцев назад

Excellent Bro!

@Zsword92 4 года назад

My voltages are all fine but I keep getting 2CAA Oxygen sensor heater function & 2CA6 Oxygen sensor temperature. All 4 are new sensors . Any ideas? I've tried harness, DME, adaptations, untwisting wires, fuses. Nothing!

@EDI-ve1be 3 года назад

Nice work identifying the af sensor issue. Your long term/multiplication fuel trims are both very negative after the sensor replacement. Did you manage to find the cause and fix for that?

@Random.Adventures. 3 года назад

You are awesome just wondering if you can show us a demo of the vanos on INPA please

@phantom700X 2 года назад

Thank you. It was useful 👍

@grantvance3686 Месяц назад

I'm having an odd issue with my n52, the bank 2 sensor is reading 0.29 volts while bank 1 is normal. I have replaced the sensor, but the problem is still the same. Help!

@lcagee 3 года назад

Great video. I like the logical trouble shooting. I’m having issues with my fan on a 93 300e which may have the same 3.2 engine???? My car was almost overheating at 120 while driving thru the McD take out line. The fan I think was off. I would think it should have been on at that temp. The fan was on yesterday. Are there two different signals to the fan??? One based on water temp and the other based on something else? Shouldn’t the fan be on at 120? I am suspicious of my wiring harness on the 93. It is the old brittle one. The wires near the temp sensor look a bit delaminated. Trying to figure out what to do. Don’t want to ruin engine. Probably gotta get that new harness in and hope that fixes it.

@getpaid38able 2 года назад

😃 great explanation of the pre-cat I have a BMW E65 doing the same thing, tested with ista/d same result, is it possible a O2 can go bad in 3 years? Can something burn out the heating mechanism? Like a recent replacement trans? or a replaced generator?

@IvesyBuilds 2 года назад

Awesome video!!

@jadejade5234 4 года назад

Very informative. 👍🏼

@friguy4444 3 года назад

Well I'm back about 10 months later and I have bought an E90 2008 335XI. (I still have the E46 M3 too). But I fear greatly that the O2 sensors need to be replaced on it as the car is having horrible cold starts with misfires on first 1 and 3 then if it is a bad cold start it's even more cylinders. One code read showed oxygen sensor code. The coils

@deeleem1724 Год назад

My all 6 plugs look black like that. Getting mixture too lean code only. Could both bank O2 be the cause ?

@11BravoSeries 3 года назад

1 NOV 2020 11:29am Central California S.O.S Bought a 2012 335i e92 n55 from this kid. He had it raced out with a vrsf catless downpipe, vrsf charge pipe & tuned with a MHD stage 1 tune. Fast forward, I gotta get it smogged. Took off the race kit, deleted tune, and put the stock parts back on. For maintenance purposes I installed new O2 sensors (i believe its 2 for this car), new spark plugs and ignition coils. Started her up, ran her for a good 5 days and I'm getting thus code. Don't know what too do, help lol. P0133: oxygen sensor circuit slow response bank 1 sensor 1. Permanent.

@oldarkie3880 4 года назад

Stock air cleaner is better than that HOT air setup. I don't see why these are used.

@skipper3069 5 лет назад

Your video is so explanatory. Need help what inpa cable to use on 2009 335i n54. E92. there so many and some of them don’t work according to users just.

@jqnshanero8531 3 года назад

So my bank 2 is doing the same...but the rear one is also is at like .6-.8 but the front one goes to 3.8-4.1 volts! So are they both bad or the cat or why are these cars such a nightmare 🤣

@dzeremidzeremi4232 Год назад

I have a bit rough idle in the morning when it's warmup it's perfectly fine but I throws up system too rich bank 2 please help?

@erickromero010 5 лет назад

i’ve been running them backwards and running rich for about a month ugh i need to switch them! i forgot to mark them when upgrading to catless downpipes

@hewaabdullah7559 3 года назад

Very good nice video 📹👍

@gagandeepsinghgill3043 Год назад

Any help! Im getting fluctuation in after cat sensors. They are jumping.

@raasalghul9211 3 года назад

Thank you for a very informative video. Please could you tell us what is the app you running on your phone and on your laptop. Are they free to download or subscription based? Many Thanks.

@FlawaPowa Год назад

Hi, could you please help, I'm a bit confused. On my BMW N53 pre-cat sensor has a long cable and they are on the left side of the engien, after cat sensor has short cable and its under the car. If I have the same reading like you wich one should I change?

@gigo6860 11 месяцев назад

So then to know if your o2 sensors are actually bad you can check the spark plugs?

@Locustandhoney 11 месяцев назад

Not necessarily but you can see differences between the banks and see the plugs are either showing rich/lean signatures. (Fuel smell and black rich or whitish color lean.

@bantoo1988 7 месяцев назад

How did you find that it is post catalyst sensor?

@FreedomToYourMind 4 года назад

nice thank you

@datlyfestyl3905 3 года назад

Have you ever had an issue when you start your car up and immediately your car starts to rev up and down repeatedly and when you step on the throttle it’s not responsive? When you put it on drive car still won’t accelerate but starts to jerk really rough?

@twinturbo8304 3 года назад

Can’t we just wire the exhaust flaps open or will that mess something up?

@shalvakhechoshvili4425 2 года назад

Hello could you help rewire (solder which wire on which) n55 o2 sensor connector on lza07-hd3 ntk japan

@imperial1037 2 года назад

I threw alot of money at my N55, 6 months of throwing parts at it i get 2 O2 sensor codes.

@Centralcoastwraps831 3 года назад

I got the same issue but I was told fuel injector ???? Help new to the 335i just bought my 335i just about a week and half ago

@audunjemtland8287 4 года назад

Amazing video. Could you clean the sensors instead of replacing? If not, why?

@VehicularDIY 4 года назад

Thanks. No they heat cycle and eventually fail, they don't just foul out.

@audunjemtland8287 4 года назад

@@VehicularDIY Thanks for answering. Seen numerous people on youtube clean them.

@floringiurgiu7454 5 лет назад

What carly alternative are you using on your phone? I.m asking about both the dongle and the software. Thanks :)

@shanedial4985 4 года назад

Just learning here, bare with me... Cylinder 6 plugs appeared wet when you removed it. Is that gas? Also, will faulty O2 sensors cause gas to collect in the cylinder? Just trying to determine if I have a bad injector in Cylinder 5 (which I get a consistent misfire) or if my O2 sensor in bank two is bad. I have JB4 installed and three days ago I performed JB4 MHD BEF and car hasn't ran right since, primarily at idle/cold starts. I get a rich gas smell when idling.

@RH-no8oi 10 месяцев назад

How are you clearing the codes with your phone?

@michaelaguirre3668 3 года назад

I’m having a similar issue I put all brand new Coils and spark plugs but my cylinders 1-3 are still misfiring and my spark plugs are wet with gas when I take em out so you think my O2 sensor Is the problem .?

@luisGarcia-wl8bk 4 года назад

I’m giving this a long shot in hope that you can reply. I’ve been having trouble with diagnosing my car since I bought an eBay inpa software but it is in German. Have very little computer skills and was wondering where you got your software from? I currently have a hp with windows 10

@martijndaemen4834 4 года назад

when you disconnect the sensor on a 318D, will it have the same effect? cause it also run bad only in idle and i don't get a engine light. greeting from Belgium! great video!

@martijndaemen4834 4 года назад

it's a N47 engine btw

@real_kensou 2 года назад

Hi ! I have exactly the same problem I think on my x6M (s63) No CEL, no hesitation on throttle, no error message , very slight instable idle, high fuel consumption, pop and bang on cold start, pop and bang on shifting with sequential mode, only black smoke (tail Pipes become black), car has +100k miles on the clock. Do you think my oxygen sensor are faulty too ?

@maddog5814 Год назад

What does it mean if down stream reads low in one of the banks?

@Lu-e 3 года назад

Got a P0172 Bank 1 too rich. Already changed the bank 1 upper 02 sensor and the code is still present even after I erased the code. Also cleaned my map sensor and nothing.

@cruisecontrol4400 3 года назад

2c7e oxygen sensor emissions control.upon starting rough idle, within 10 seconds it straightens out, but Engine running rich, you can smell the petrol. 2 oxygens sensors in the engine bay have been replaced, i take it thats pre cat, so now i need to replace 2 by the cats?

@raymartinez5327 2 года назад

I have an 2007 335i and I am getting a u30b7 any ideas on what it can be ?

@olenairsoftguy88 3 года назад

great great great video!

@MyUniverseX Год назад

I did just today change my downpipes to the original ones just to pass the TC. And got those error, is it possible that this happend cause i put the oem downpipes back in( stage 3 and upgrade turbos)?