O2 Sensor Wiring
Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
Sorry your thread got crapped on. We just seem to have an issue with one forum member going around to every thread that I and one other member post in for the sole purpose of making ad hominem attacks on us. For the purpose of drawing a line between real information and these attacks, I believe it's important that it be confronted when it happens. After that, everyone is free to make his/her own decisions based on the info provided.
Team Owner
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From: Hartford WI
Le Mans Master
Joined: Aug 2015
Posts: 6,090
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From: St. Charles MO
Originally Posted by Bosch
- The sensor receives the reference air through the connection cable. This means that the connector must be clean and dry. Contact spray, and anti-corrosion agents etc. are forbidden.
- The connection cable must not be soldered. It must only be crimped, clamped, or secured by screws.
Last edited by MatthewMiller; Sep 9, 2018 at 03:18 PM.
Team Owner
Joined: Jul 2004
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From: Hartford WI
The picture you posted literally shows what is being stated: the reference air is entering a passage from the black pigtail wire. Again, not every kind of O2 sensor gets its reference air this way, and some apparently don't need a reference at all. But ours do. Here's yet another reference, straight from the manufacturer:
ETA: Anyone who wants more references on this can just google "oxygen sensor reference air solder." You'll get a long list of informative sources.
ETA: Anyone who wants more references on this can just google "oxygen sensor reference air solder." You'll get a long list of informative sources.
Le Mans Master
Joined: Aug 2015
Posts: 6,090
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From: St. Charles MO
What they term "cable connector" is not the wire. So what you are saying is that the air comes from the connection between the air intake harness, travels down the electrical wire and becomes the reference air for the O2 sensor? Diffusion isn't an instant thing in that case so how would the sensor get an accurate reading of what the reference air is at the connection between the harness and the sensor in a timely fashion? If you say that we cannot cut and solder where the connection is which, in this case is ON the sensor itself, I totally agree but if you say the ambient air travels down the sensor wire and becomes reference for the sensor, I do have my doubts.
Last edited by MatthewMiller; Sep 10, 2018 at 12:35 AM.
Race Director
Joined: Oct 2008
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From: Lansing MI
That's exactly what I'm saying: the reference air travels down the sensor wire (between the conductor and the insulation sheath) to the inside of the sensor itself. Doubt it all you want, but please look at the references I have cited and reread Ed Ramberger's post. If you choose not to believe someone who worked in the industry plus a reference from a major sensor manufacturer plus a couple other references from industry sources...I'm not sure what else to tell you.
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,074
From: Lansing MI
What they term "cable connector" is not the wire. So what you are saying is that the air comes from the connection between the air intake harness, travels down the electrical wire and becomes the reference air for the O2 sensor? Diffusion isn't an instant thing in that case so how would the sensor get an accurate reading of what the reference air is at the connection between the harness and the sensor in a timely fashion? If you say that we cannot cut and solder where the connection is which, in this case is ON the sensor itself, I totally agree but if you say the ambient air travels down the sensor wire and becomes reference for the sensor, I do have my doubts.
Team Owner
Joined: Jul 2004
Posts: 28,422
Likes: 3,275
From: Hartford WI
That's exactly what I'm saying: the reference air travels down the sensor wire (between the conductor and the insulation sheath) to the inside of the sensor itself. Doubt it all you want, but please look at the references I have cited and reread Ed Ramberger's post. If you choose not to believe someone who worked in the industry plus a reference from a major sensor manufacturer plus a couple other references from industry sources...I'm not sure what else to tell you.
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Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
I have no suggestions, because it's never occurred to me to test to see if I could get away with something that so many references say not to do. Especially when there's no need, as plug-in extensions exist or can be made. The thing about running a test like this is that nobody has claimed that cutting and soldering will have a 100% failure rate. So one test where you get away with it won't prove anything. You'd need to solder a bunch of sensors to get a significant test outcome.