I figure while I await for my appointment to get my car tuned I should toss the MTX-L I bought in. Granted, I'm not sure the Crome-chipped P06 is even reading the O2s, so I'll have to unplug it and see if it throws a code.





To that end, I have the resistors for the heater wire ready to go. What I do not know about is which signal wire to patch in to the 0-1v output from the MTX-L. If the ECU is set to run in closed loop and I probe the highlighted wires, will only one of them show the fluctuating signal, and if so, will a cheap dmm be able to see the switching? If the ECU is set not to operate in closed loop, will unplugging the primary O2s fail to cause a CEL?