trying to figure out the elm torque combo to find my rough idle issue
results were
b1s1 no data
b1s2 .1 to .9volts alternating
b2s1 no data
b2s2 jumps to .8 volts and hangs there

so looks like b2s2 has an issue correct?
I am not sure because the #1 sensors show "no data" message and not sure if that is correct. I checked all 4 sensor options in torque for each bank, #1,3,4 all show no data, only #2 has a voltage reading

And a quick bank refresher please, bank 1 is where? front or rear, I believe 2-4-6 cylinders are at the front

Thanks
201743miles, oil in well 2, new project ahead...

 

innzane, you are correct for the banks/cylinders. Bank 1 is against the firewall, bank 2 is against the radiator.

As for the O2 sensor readings, the reading of an O2 sensor should vary between 0.1 and 0.9 VDC. So, this would lead me to say that sensor B1S2 is good. It is responding exactly like it should. As for the B2S2 sensor, that would be telling the car that it sees the exhaust downstream of the cat as being too rich and that the cat is either 1) not up at temp and therefore cannot function properly (occurs during the first few minutes of a car running), or 2) cat is not functioning (assuming it is at temp, which it will be if the car has been running). As for the B1S1 and B2S1 sensors saying "no data", this could be because the motor was cold or there is a failure of both O2 sensors. Keep in mind that when you first start a car, there is a small heater inside the O2 sensor that helps get it up to temperature (even though the exhaust may not be hot enough) to allow the O2 sensor to start reading earlier in the engine running time. Because you are getting a good reading from one of the sensors, this would lead me to believe that your fuses are good. So, this would either leave failed upstream sensors or the motor was cold. You don't give enough info as to what the state of the engine temp was.

 

OK, thanks. I will check it out in the morning while driving and see if a difference when hot.

 

I'd check the fuel trims.

Odd that the app can't cope with the upstream sensors (they're very common ones).

 

Ok. Tried aap and the elm in the work van and it read the upstream sensors, but still not in the jag. Will youtube the fuel trims, I seen them but they are still in greek.

 

youtu what now? They're just numbers...

 

I get no readings on sensors 1-3-4 for either bank
bank 1 sensor 2 varies from -7.8 to -3.9
Bank 2 sensor 2 stays mainly at -2.3
bank 1 stays close to -7.8 under load, drops if not
bank 2 stays the same, but has climbed higher in traffic, -6.0 ish

car runs the same with any combo or all 02 sensors uplugged. put new plug and swapped coils in C4 and runs the same, still get C4 misfire code, car runs better/different when the low fuel light is on

 

Post #4...

 

I am gonna buy an earlier version of the elm and see if it will read, back in a week or sooo. Last one took 11 days from a US seller, boo!