high pitch noise at idle

[Bluevitz-rs]

Those resistance values are for an unplugged sensor to make sure it's within static value. Those are not for when the car is running plugged in. So in order to read rich or lean you need to measure the output voltage of the sensor.

[mokmok]

Originally Posted by Bluevitz-rs

Those resistance values are for an unplugged sensor to make sure it's within static value. Those are not for when the car is running plugged in. So in order to read rich or lean you need to measure the output voltage of the sensor.

That's exactly how i tested it, engine off and in my garage, so i was around the 20 degrees they recommend for testing. The car seems to run lean when it tries to stall my obd2 with bluetooth to my phone reads 15.5-16 when it makes the noise and stalling

[CTScott]

Originally Posted by Bluevitz-rs

Those resistance values are for an unplugged sensor to make sure it's within static value. Those are not for when the car is running plugged in. So in order to read rich or lean you need to measure the output voltage of the sensor.

The ECM maintains a constant voltage on the sensor and it measures the current required to maintain that constant voltage to determine AFR. So, if you measure the voltage on the sensor it will always read the same unless there is something wrong with the circuit within the ECM.