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Discussion Starter · #1 ·
is the 02 sensor special to this bike or can i purchase one at a local autoparts store?

thanks,
dale
 

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Best deal I have found is online from www.rockauto.com

Bosch Universal 15729 O2 Sensor for $49.79 plus shipping


HTH,

Ron
 

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I found something on replacing the O2 sensor that was posted a few years ago. A member had found the Bosh part number for a plug and play sensor part number is 0 258 003 475. I did a search a few weeks ago and found the sensor for around $100.

If I understand correctly the universal sensor will involve some cutting of wires and splicing them to the new sensor.



Take a look in the files section of the forum for the complete instructions.
 

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Discussion Starter · #5 ·
George,

Have you done it? "use the universal model that is" Im a little nervous about cutting the wires.

The spark knock is driving me crazy. I going to start changing parts until is stops. "Motor included" :)
 

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dnifong said:
George,

Have you done it? "use the universal model that is" Im a little nervous about cutting the wires.

The spark knock is driving me crazy. I going to start changing parts until is stops. "Motor included" :)
I did one not long ago. Be sure to get the four wire sensor and cut the old sensor end of the plug off. Solder the OEM plug to the new sensor. There are two white's, it doesn't matter which white on the corresponding wires they go to .



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dnifong said:
George,

Have you done it? "use the universal model that is" Im a little nervous about cutting the wires.

The spark knock is driving me crazy. I going to start changing parts until is stops. "Motor included" :)

Dale,

Describe your "spark knock" to us. What year is your bike? Are you using premium fuel? About what kind of gas mileage are you getting by calculating it manually?

Normally if an O2 sensor is not functioning you will have terrible gas mileage. Before you spend money on that, you might want to check the GS 911 register to see if anyone close by can run a test on your system. Try this link:

http://www.bmwlt.com/forums/showthread.php?t=24561&highlight=registry

Ron
 

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Yes, I would also like to hear about the spark knock.

My 2000 LT used to get 44mpg and now gets 33mpg based on
the computer display. I also noticed the bike stutters
as I pull away from a stop light. I have to give it alot
of gas and feather the clutch because it feels like it is
going to kill.

Thanks
 

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When mine went flatline gas MPG was down to 34 and too much black smoke .
When fuel control computor senses a "slow" switching O2 sensor which is the beginining of a O2 sensor going bad ,it will go to open loop control and richen the fuel to safe limping mode and on a OBDII car ,set check engine light .

I have installed the Bosch universal ,the wires that are cut and spliced are not the bike wire harness
the universal Bosch comes with the splice kit , read the instructions and you will have no problems .
The splice must be clean and secure as the signal is from .3 to about .9 VDC and it switches up and down many times a second

Does not sound like your O2 sensor is bad
I would look for vacuum leaks that are too big for the injection system to overcome.The bad thing about fuel injection is that it will adjust for vacuum leaks and make them harder to find.
 

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When mine went bad, the bike went into limp mode as well.

However, In doing some research, not all O2 Sensors are made equal. There are differences in length which can lead to incorrect flow sensing.

I purchased the one for the LT from Chicago BMW, took just a couple of days to get it and was priced competitively.

If you think thats the problem, then also read my post on my replacement:
http://www.bmwlt.com/forums/showthread.php?t=14687
 

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dnifong said:
George,

Have you done it? "use the universal model that is" Im a little nervous about cutting the wires.

The spark knock is driving me crazy. I going to start changing parts until is stops. "Motor included" :)
Bosch part # 0 258 003 475... no cutting of wires.... theres a post in here somewhere with some good tips in doing the replacement... attaching a string when pulling the wire thru so u can snake the new one back up back
 

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It's not as difficult as some have mentioned. I was able to fish my cable up behind the frame with the assistance of a pair of needle nose plyers to grab the plastic connector just alittle for me to get my fingers around it.

What is mentioned in my post (link above) that is important, is you want to be carefull in unscrewing the O2 sensor once you've broken it loose with the wrench, you want to watch for cutting your fingers open on any excess flange that may have been there from casting the product.

It got the tip of my index finger and it was pain for the rest of the week.
 

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gbob said:
I have installed the Bosch universal ,the wires that are cut and spliced are not the bike wire harness
the universal Bosch comes with the splice kit , read the instructions and you will have no problems .
The splice must be clean and secure as the signal is from .3 to about .9 VDC and it switches up and down many times a second
I would be VERY wary of using any splices on an O2 sensor. The signal is VERY small and is supposed to swing from 400mv to 600mv..constantly switching up and down. Any extra resistance induced by the splices would wreak havoc with the readings. Whenever I have to "splice" an O2 sensor connector to the pigtail I always solider it with silverbearing solider and cover it with weatherproof heatshrink, the kind that has a heat activated glue on the inside surface to seal it up good. Like the stuff here http://www.jamestowndistributors.com/userportal/show_product.do?pid=669
 
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