OBD app won't detect front o2 sensor

[RaydenOBD]

Still searching .. that makes no sens, just like if my o2 sensor was invisible to OBD apps, also tried switching ISO didn't make a difference.

[xanthefin]

I am gonna leave this now as boring technical information which i did end up confirming now too with on my bench ME7 ECM.

Screenshot_20240523_231253.jpg (63.02 KiB) Viewed 1212 times

ME7 Volvo (not all?.. all? i dont know) ECM only shows PID 15 Aka Oxygen Sensor 2 registered for Standard OBDII Emission data even though shows for two Sensors to be present so no PID 14 Front Oxygen sensor reading for this Standard OBDII way.


.. but after little accident i found how to make natively ELM327 talk Live Data finally with CAN Bus very flawlessly on P80 and P2 systems so now after couple days work included ME7 in there as starters.

Screenshot_20240523_214635.jpg (25.27 KiB) Viewed 1212 times

[ZionXIX]

.. but after little accident i found how to make natively ELM327 talk Live Data finally with CAN Bus very flawlessly on P80 and P2 systems so now after couple days work included ME7 in there as

Xanthefin, Im trying to use the app to read O2 sensor voltage as well as fuel trim to better diagnose my oxygen sensors. Is the OBD-II capable of reading this on a 1996 850 turbo? I haven't found a way to see that yet.

[xanthefin]

.. but after little accident i found how to make natively ELM327 talk Live Data finally with CAN Bus very flawlessly on P80 and P2 systems so now after couple days work included ME7 in there as

Xanthefin, Im trying to use the app to read O2 sensor voltage as well as fuel trim to better diagnose my oxygen sensors. Is the OBD-II capable of reading this on a 1996 850 turbo? I haven't found a way to see that yet.

Sorry much of late reply. I was actually in Japan when this was posted.

On 850 if its Motronic M4.4 yes it has both Lambda Voltages and Fuel Trims but M4.3 not with App sadly due how it talks.

[ZionXIX]

.. but after little accident i found how to make natively ELM327 talk Live Data finally with CAN Bus very flawlessly on P80 and P2 systems so now after couple days work included ME7 in there as

Xanthefin, Im trying to use the app to read O2 sensor voltage as well as fuel trim to better diagnose my oxygen sensors. Is the OBD-II capable of reading this on a 1996 850 turbo? I haven't found a way to see that yet.

Sorry much of late reply. I was actually in Japan when this was posted.

On 850 if its Motronic M4.4 yes it has both Lambda Voltages and Fuel Trims but M4.3 not with App sadly due how it talks.

I believe I have the Motronic 4.3. How do I see O2 sensor numbers?

[xanthefin]

Xanthefin, Im trying to use the app to read O2 sensor voltage as well as fuel trim to better diagnose my oxygen sensors. Is the OBD-II capable of reading this on a 1996 850 turbo? I haven't found a way to see that yet.

Sorry much of late reply. I was actually in Japan when this was posted.

On 850 if its Motronic M4.4 yes it has both Lambda Voltages and Fuel Trims but M4.3 not with App sadly due how it talks.

I believe I have the Motronic 4.3. How do I see O2 sensor numbers?

I think this ECM has been touched best by rkam as this falls under older diagnostic protocols.

But if you are in old ways are best and insist manual labour.. and you are radio amateur who knows morse code.. you are in luck!


You need transfer ECM into DTM 4 mode by shorting Pin with button # 3 in OBD port to GND 4 times. (this is by other manual DTM 3 so 3 times so Volvo is not sure how document this)
Now communication is at rate of x10 so you need be quick reading angrily flashing led light (OBD Port Pin #3 is + and use GND Pin # 4 or 7) and input commands with button you used in previous step.

Next you need know command but if it would be same as Fenix 5.2 then in theory you need quickly input value 53 in decimal so press button exactly that amount in a second!

The now you should get back 8 bytes of data which in theory is what you looking for the value.


..or get Volvo VST handheld device i am sorry.

[ZionXIX]

Sorry much of late reply. I was actually in Japan when this was posted.

On 850 if its Motronic M4.4 yes it has both Lambda Voltages and Fuel Trims but M4.3 not with App sadly due how it talks.

I believe I have the Motronic 4.3. How do I see O2 sensor numbers?

I think this ECM has been touched best by rkam as this falls under older diagnostic protocols.

But if you are in old ways are best and insist manual labour.. and you are radio amateur who knows morse code.. you are in luck!


You need transfer ECM into DTM 4 mode by shorting Pin with button # 3 in OBD port to GND 4 times. (this is by other manual DTM 3 so 3 times so Volvo is not sure how document this)
Now communication is at rate of x10 so you need be quick reading angrily flashing led light (OBD Port Pin #3 is + and use GND Pin # 4 or 7) and input commands with button you used in previous step.

Next you need know command but if it would be same as Fenix 5.2 then in theory you need quickly input value 53 in decimal so press button exactly that amount in a second!

The now you should get back 8 bytes of data which in theory is what you looking for the value.


..or get Volvo VST handheld device i am sorry.

I appreciate the help anyway. Just the other day your app helped to clear a transmission code that would not respond to conventional obd2 scanners.