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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Confirmed: Pre-cat wideband O2 sensor replacement part #s



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      08-02-2012, 05:12 PM   #1
JamesM3M5
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Just wanted to give a shout-out to the group that the Bosch pre-cat wideband sensor 17098 (full part number is 0 258 017 098) for bank 1 on the N54 is ALSO good to use on bank 2 as well. The Bosch number for bank 2 pre-cat sensor is 17102, but is not easily available since it is specific to the N54 engine only, bank 2. This makes the rear sensor much more expensive for an OEM replacement or a dealer-only part if you can't find one. The 17098 fits all N52 engines (bank 1 and 2) and all N54 engines (bank 1), so it's cheap. Currently $107 each on Amazon.com!! (02-Aug-2012)

You can use the 17098 sensor for both banks. Both are Bosch LSU4.9. The difference is wire length.

Carefully mark the connector with a white or silver paint pen with 1 or 2 to denote bank 1 or bank 2 before installing the sensors. Bank 1 connector on the harness is closer to the front of the engine, and bank 2 is further rearward, which makes that part easy. Loop the excess wire for the bank 2 sensor back and forth across the handy plastic clips that hold the wires on the fuel rail.

If you have a way to clear adaptations (such as Procede command center, JB4, BT tool, Cobb AP?) then do so before restarting the car. Your old O2 sensors may have been reading slightly leaner or richer, and resetting the adaptives forces the ECU to relearn them more quickly than if you just refired and drove off.

Please also remember that YOU CANNOT CUT OFF THE PLUG from a Bosch LSU and wire it onto a different sensor. There is a calibration resistor that is set from the factory, and that plug MUST stay with the sensor, or your O2 readings will be inaccurate.
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      08-02-2012, 05:20 PM   #2
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Great info thanks ! Ur a wealth of info, r u a bmw mechanic? In all ur posts it sounds like u are..
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      08-02-2012, 05:31 PM   #3
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So it sounds like you are just rerouting the wire that goes from the sensor to the connector thing on top of the engine in a way that requires less distance. Correct?
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      08-02-2012, 07:43 PM   #4
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No, actually the 17098 is the longer wire. The bank 2 sensor normally comes with a 200mm shorter wire, but the excess wire left over from using a front bank sensor in the rear bank is easily coiled up neatly. Just make sure you clearly label front and rear sensors since it would be really easy to screw it up. The benefit to using two 17098 sensors is about $90-100 savings. I just checked the 17102 on Amazon.com, and it's $200 versus the 17098 at $107.
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      08-02-2012, 07:49 PM   #5
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Yes, I own a BMW race shop. Not a sponsoring vendor, so I don't want to plug myself here. Just trying to share and help out.
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      08-02-2012, 08:18 PM   #6
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Quote:
Originally Posted by JamesM3M5 View Post
No, actually the 17098 is the longer wire. The bank 2 sensor normally comes with a 200mm shorter wire, but the excess wire left over from using a front bank sensor in the rear bank is easily coiled up neatly. Just make sure you clearly label front and rear sensors since it would be really easy to screw it up. The benefit to using two 17098 sensors is about $90-100 savings. I just checked the 17102 on Amazon.com, and it's $200 versus the 17098 at $107.
Ok. Got it. Thanks for the info, this is extremely useful.
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      08-02-2012, 08:27 PM   #7
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And I don't want to speak too soon, but I *think* that they have finally eliminated my light load under 2k RPM misfire/bump feeling I've been trying to get rid of for a while now. Should have replaced O2 sensors before injectors. Damn.
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      08-02-2012, 08:27 PM   #8
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Nice tip, very helpful!
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      08-02-2012, 09:20 PM   #9
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So our o2 sensors ARE wideband sensors? Nice. I'm still thinking of my old dsm days and adding widebands.
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      08-02-2012, 09:36 PM   #10
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So our o2 sensors ARE wideband sensors? Nice. I'm still thinking of my old dsm days and adding widebands.
Yes, just part of why the N54 is so flexible with regards to power, adaptation to E85 blends, etc. A lot of newer cars have widebands from the factory...they are cheap in this age and with emissions and fuel economy standards today, they really can't afford not to keep a razor sharp feedback loop on fueling.
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      08-03-2012, 08:45 AM   #11
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Yes, I own a BMW race shop. Not a sponsoring vendor, so I don't want to plug myself here. Just trying to share and help out.
how far is your place from HARRISBURG PA? just out of curiousoty of course.
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      08-03-2012, 09:06 AM   #12
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Probably about 2 hours. We're right next to Dulles airport.
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      08-03-2012, 09:19 AM   #13
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Great info. So it looks like I should replace o2 sensors before replacing injectors?
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      08-03-2012, 12:07 PM   #14
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What is the problem you're experiencing?
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      08-03-2012, 12:10 PM   #15
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James,
How many miles did you have on your O2s? Does anyone know of a way to read how much 'adoption' the ECU is applying to the O2 sensors; perhaps that would be a valuable metric for replacement? Perhaps measuring a delta between a voltage read from harness and reported by ECU via Procede/BT Cable/ etc?
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      08-03-2012, 01:30 PM   #16
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Quote:
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Probably about 2 hours. We're right next to Dulles airport.
Oh man we just went to the air and space there. Would have loved to have seen your shop.
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      08-03-2012, 01:47 PM   #17
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Thanks James, good info.
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      08-04-2012, 09:22 AM   #18
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James,
How many miles did you have on your O2s? Does anyone know of a way to read how much 'adoption' the ECU is applying to the O2 sensors; perhaps that would be a valuable metric for replacement? Perhaps measuring a delta between a voltage read from harness and reported by ECU via Procede/BT Cable/ etc?
59k miles, problem was noticed around 53k miles.

Well, that's not really possible. The wideband controller is quite complex to "read" the output of a 5-wire wideband sensor. It's a regular narrowband sensor with an oxygen pump added on, and the current and polarity required by the oxygen pump are what the ECU or any other wideband meter reads.

You can check the adaptives, which I never bothered to do while the problem was occuring. I suspect I may have seen a negative adaptive (indicating the ECU is pulling fuel). I think the O2 sensors were reading erroneously richer than they were supposed to. This caused the ECU to pull fuel resulting in lean misfires under very light load low RPM conditions.
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      08-04-2012, 02:07 PM   #19
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Cool info. Thx.
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      09-12-2012, 01:38 PM   #20
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Great info! Thanks.
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      09-12-2012, 01:43 PM   #21
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This is a great find. Saves us $$ from buying from the dealership
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      09-12-2012, 02:14 PM   #22
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Quote:
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Yes, I own a BMW race shop. Not a sponsoring vendor, so I don't want to plug myself here. Just trying to share and help out.
this explains quite a bit. thanks for all your invaluable insight on this platform... as you address a lot of the more common problems associated with the N54 that many of us see.
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