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Old July 17th, 2019, 06:45 PM   #1
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Lambda Sensor Replacement

So I have had a CEL on the 821 for a while. I had the code read and it said front horizontal lambda sensor or something along those lines. I read that the threading is the same for most modern Ducatis so I figured instead of spending $300 + on a new sensor from Ducati I could buy and wire one in.

I got one for a monster 821 thinking it'd be the closest save for a completely different fitting. I also found one for a 939 that looked on paper like the same connection. Figured if it didn't work I could use a spare for the 939 SP. Well, they do all thread in, but the sensor bit is different (pics below, smallest is the hyper 821, next in size is the 939 and the biggest one is the monster 821).

So the question is, can I really wire in any old 4 wire sensor or am I going to have the bite the bullet.

Second question is there any way to test a sensor before I cut and splice wires. Basically is the CEL going to clear as soon as a good sensor is connected and sending signal or does the sensor need to be installed and the bike ridden for a bit?

I noticed when I removed the sensor on the front header it was coated in white dust (oxidation?) so I cleaned that off and installed it again hoping that'd clear things up, no luck.

Finally any idea how to get the heat shield off the rear header without removing it from the engine? There is one allen bolt that I can't seem to get to as the frame is blocking access. Figured I should pull the rear sensor just to compare it to the front one.

Thanks in advance, as always.
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Old July 17th, 2019, 06:46 PM   #2
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pics..
Attached Thumbnails
Lambda Sensor Replacement-img_20190717_192251.jpg   Lambda Sensor Replacement-img_20190717_192600.jpg  
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Old July 17th, 2019, 10:01 PM   #3
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I bought a pair of 2016 Monster 821 sensors. I didn't swap on a recent garage day because the wire colors don't completely match. Our OEM sensors have 4 colors and the Monster sensors only have 3, with 2x gray wires.

I didn't see the need to remove rear heat shield to pull the rear lambda. The rear does require a 14mm sensor socket with the wire groove.
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Old July 18th, 2019, 06:45 AM   #4
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Quote:
Originally Posted by gatdammit View Post
I bought a pair of 2016 Monster 821 sensors. I didn't swap on a recent garage day because the wire colors don't completely match. Our OEM sensors have 4 colors and the Monster sensors only have 3, with 2x gray wires.

I didn't see the need to remove rear heat shield to pull the rear lambda. The rear does require a 14mm sensor socket with the wire groove.
The Monster owners manual doesn't state the wire colors for the sensor itself, but you can use the wiring diagram to compare to ours to get it right.

Ducati has the owners manual on their site, with nice wiring diagrams in them.

Clicky: https://www.ducati.com/ww/en/service.../owner-manuals
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Old July 18th, 2019, 09:48 AM   #5
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Sensor socket, that's definitely a thing I need! As for the wiring, sounds like that can be figured out, but should I be concerned about the different size and profile of the sensor or is does that not matter for a narrow band sensor?
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Old July 19th, 2019, 12:40 AM   #6
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Somebody on here swapped out Monster sensors. They worked.
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Old July 19th, 2019, 08:06 AM   #7
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Quote:
Originally Posted by gatdammit View Post
Somebody on here swapped out Monster sensors. They worked.
Sweet. I'm going to give it a shot this weekend. I searched around here but I guess I may have missed that thread, appreciate it!
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Old July 20th, 2019, 05:08 AM   #8
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If you figure out the wire pairing, please post. My monster sensors have White/ Black/ Grey/ Grey. The OEM's are White/ Black/ Blue/ Grey, i believe.
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Old July 22nd, 2019, 11:05 AM   #9
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Will do, didn't get to it this weekend as jetting work on the dual sport bike ate up my Sunday afternoon.
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Old July 29th, 2019, 03:01 PM   #10
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Originally Posted by gatdammit View Post
If you figure out the wire pairing, please post. My monster sensors have White/ Black/ Grey/ Grey. The OEM's are White/ Black/ Blue/ Grey, i believe.
The stock sensor side wires are Purple / White / Gray / Black.

I believe it goes like this:

Purple - White Heater
White - White Heater
Gray - Black Sensor +
Black - Gray Sensor -

I have connectors and pins coming to try this myself.
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