Oxygen sensor for hypermotard 939

Duongtohm939 · May 20, 2021

Hi guys. I need your help. My vertical engine oxygen sensor is dead right after install the rapidbike evo. I try to look another one in ebay but cant really find one. A seller selling a 821 OS and said it also good for 939. I bought 2 and it at my door after 1month and a half. Then i found out the connection is diffirent. I managed to pull it out. My question is do it go the same order as 939 one?
821 one: violet white grey black
939: white white grey black

N4teTheGreat · May 20, 2021

You can wire it, someone on here figured out (for me) how to wire up a monster 821 sensor as well. There are also cheap ones on eBay (presumably from China) that appear to work fine.

Duongtohm939 · May 20, 2021

N4teTheGreat said:
You can wire it, someone on here figured out (for me) how to wire up a monster 821 sensor as well. There are also cheap ones on eBay (presumably from China) that appear to work fine.

Hi man i know but i too curious to wire it. Is it the same order as 939 . I got mine from autoparts. Around 63 each

gatdammit · May 20, 2021

Search. I think I did this and followed the post to determine wiring order.

Duongtohm939 · May 20, 2021

gatdammit said:
Search. I think I did this and followed the post to determine wiring order.

Ur is 939 also?

gatdammit · May 21, 2021

821. Probably same wiring harness as 939.

Duongtohm939 · Jun 3, 2021

The wire for 939 goes as the same 821. While doing it i see someone sell the same one for 939 on a rsrv 2016. i read someone 2 heaters wire,+ then -. The bike run smooth now. No delay in thottle together with rapidbike evo. I am so happy. Spend 140 usd for 2 oxygen sensors.

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Araitim · Jun 3, 2021

The 821 and 939 use different O2 lambda sensors. The values are also different for the range they are reading. Some 939 sensors came with an exhaust I bought. I tried to use them and they didn't work. As mentioned above there are 2 heater wires and 2 sensor/data wires. I found some reasonably priced 821 sensors on Amazon and they have been working great. I have never looked for the 939 sensors though.
Larger one is 939, smaller is 821. color change between the two as well but a pinout is available for pretty much anything

Duongtohm939 · Jun 3, 2021

Araitim said:
The 821 and 939 use different O2 lambda sensors. The values are also different for the range they are reading. Some 939 sensors came with an exhaust I bought. I tried to use them and they didn't work. As mentioned above there are 2 heater wires and 2 sensor/data wires. I found some reasonably priced 821 sensors on Amazon and they have been working great. I have never looked for the 939 sensors though.
Larger one is 939, smaller is 821. color change between the two as well but a pinout is available for pretty much anythingView attachment 3918 View attachment 3919

I have so many pictures but when i post it said oversize.
I wire a rapidbike to my bike (939) the vertical os fail later the horizontal one. I changed 2 to 821 o.s ( would be the same as you found in amazon ) the first trip after that. My bike change so much,better acceleration,no hesitation,less backfire. But it took me alot of time because the connections of 821 o.s are smaller.

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Duongtohm939 · Jun 3, 2021

When the job almost done i find out the hypermotard 939 using the same o.s as aprilia rsv4 2016 (NTK bb001 or something,you can see it in the tip of 939 o.s )

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Araitim · Jun 3, 2021

How did you wire it? Which were the sensor wires and which were the heater wires? I have read of people I stalling wide band sensors in place of these OEM narrow band sensors with good results as well. I couldn't get good readings when I installed the 939 sensors in my 821. By "good readings" I'm referring to when the Rapidbike is telling me in the auto correct mode. Every value was -5, to me this indicated that the sensor values were different than the 821 and there for calling for a constant -5 correction.

Araitim · Jun 3, 2021

For my files, I downloaded "lit photo" app and compress every pic by 50%. This usually lets me post pics quickly but sometimes it still says a pic is too big.

Duongtohm939 · Jun 3, 2021

Araitim said:
How did you wire it? Which were the sensor wires and which were the heater wires? I have read of people I stalling wide band sensors in place of these OEM narrow band sensors with good results as well. I couldn't get good readings when I installed the 939 sensors in my 821. By "good readings" I'm referring to when the Rapidbike is telling me in the auto correct mode. Every value was -5, to me this indicated that the sensor values were different than the 821 and there for calling for a constant -5 correction.

The wire order going like this: 821 V W(heater) G+ B-. 939 is W W(heater) G+ B-. Maybe diffirent for me i change 2 at the same time. It fixed the on off thottle at low speed and help acceleraton below 7000 rpm. Should do more ride before conclusion.

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Duongtohm939 · Jun 3, 2021

Araitim said:
How did you wire it? Which were the sensor wires and which were the heater wires? I have read of people I stalling wide band sensors in place of these OEM narrow band sensors with good results as well. I couldn't get good readings when I installed the 939 sensors in my 821. By "good readings" I'm referring to when the Rapidbike is telling me in the auto correct mode. Every value was -5, to me this indicated that the sensor values were different than the 821 and there for calling for a constant -5 correction.

Anyway 821 has good supply of o.s online. For me i cant find anywhere new instead ducati oem part that will cost me 226£. I try to find used oem exhaust system too,but the o.s stick to it maybe old,maybe it won't work. I look up the manual,wires going as the same order for hm 821 2013 to hm 939 2017. Mine is 2017.

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Oxygen sensor for hypermotard 939

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