O2 Sensor Names

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  • Last Post 05 April 2018
Charles Kim posted this 16 February 2018

Hello,

 I love this program and hope that it becomes fully functional and gets better!

I'm diagnosing the O2 sensors on my 05 CTS and having funny names and reading...

I have no clue what O2CS1 (Bank 2) is versus O2CS5 (bank 2) is... I have 4 sensors.

The other names are just as confusing.

Also the O2CS readings are all in milliAmps.  Is this correct?  Not sure what I'm looking at... shouldn't we be looking at milliVolts that are listed in PID 05?

Please please please, include a section or a pop up that explains what the dynamic readings are showing me,

Please improve the names of the O2 sensors... It is not clear.

 

Thanks again for the great work!

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inCarDoc posted this 21 February 2018

Yes, sorry, it might be confusing with the various Lambda (O2) sensors names and types. We are planning to do next try with renaming and re-arranging those sensors with one of the next releases.

Original source is the OBD-II PIDs list.  It specifies 3 groups by up to 8 parameters, when each parameter represents some "dual" value, for example voltage and fuel trim. Usually first "quartet" in group represents sensors of Bank 1, the second "quartet" - Bank 2. Deeper meaning, context and scope of use for each group requires comments from some engine specialists... so somebody who could comment or explain is highly welcome here

Thanks!

 

Charles Kim posted this 21 February 2018

sensor 1 (wide-band a/f sensors) Lambda values would be helpful if coupled with the values in mAmp.

Is there a way to set the zero on multiple graphs like two different fuel trim to share the "0" value.  It would be easier to compare and watch for drift or bias issues.

inCarDoc posted this 21 February 2018

sensor 1 (wide-band a/f sensors) Lambda values would be helpful if coupled with the values in mAmp.

Is there a way to set the zero on multiple graphs like two different fuel trim to share the "0" value.  It would be easier to compare and watch for drift or bias issues.

Unfortunately not. "0" and scale now automatic and independent for each parameter. Have idea to share 0 and scale if parameters have the same type, but not implemented yet.

Kike posted this 03 April 2018

I´m also a little bit confused with the notation of the oxigen sensors...

I have a 2009 petrol BMW 320i with four cylinders in line. As far as I know, it has 3 oxigen sensors in a "Y"configuration:

  • 2 oxygen sensors before the catalityc converter
  • 1 oxygen sensor after the catalityc converter.

I would expect to get 3 lectures from the reader, one from each sensor, something with a notation similar to the following:

  • "Bank 1, Sensor 1"  and  "Bank 2, Sensor 1"  for the two sensors before the catalityc converter
  • "Bank X, Sensor 2"  for the one sensor after the catalityc converter

 

But I get only 2 lectures (instead of 3) with the following notation:

  • "Bank 1, Sensor 2V"  and  "Bank 2, Sensor 2V"

 

The questions are:

  • Where is the third sensor lecture?
  • Do these lectures correspond to pre- or post-catalityc converter lectures?

 

PS: Refer to this page for the description of the locations of the oxygen sensors: http://o2sensors.com.au/static/o2-sensor-identification-and-locations

inCarDoc posted this 04 April 2018

Yes, once more sorry for the confusing naming. 

By fact OBD-II standard suppose up to 8 O2 sensors support (with a few parameters from each sensor). At most case that is 2 sensors (one before and one after catalytic block) with up to 4 banks. But unfortunately different manufactures might treat order and naming of sensors bit different. So sometimes it's hard to "map" exact sensor position.

At your case, as you see only 2 sensors, that is "one before and one after catalytic block" for the single bank.

Unfortunately it looks like all 3 sensors just does not mapped to OBD-II protocol, quite possible that 2 pre-catalytic sensors are merged into one parameter or taken only one... that is rather question for BMW

To read all 3 sensors separately one might need some specialized software that able to read parameters with internal BMW protocol (instead of OBD-II) and possibly have some details.

Thanks!

 

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Kike posted this 05 April 2018

All right! Thank you for such a prompt answer. Actually one of them takes about 10min to warm up and measure, so it definitelly must be the post catalytic sensor as you say. Thank you!