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I was also reading about the high input impedence on the o3 sensor and will need to be careful if measuring te resistance. Can I just do the voltage measurement and check for 0 to 1 volt on the when ...

Thanks,

I have reset the code and it is a hard fault. It comes back immediately when reset and restart the car.

I'm good with electronics. All I need to do is find this thing....and the connec ...

I have a 97 2.5 TL and have a fault code of P0135 (O2 heater circuit malfunction).

Before I spend hundreds of $$$ on the sensor(s), is there any way to tell

1) if one is bad and
2) which one is ...