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post #1 of 5 (permalink) Old 03-21-2017, 07:40 PM Thread Starter
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O2 Sensor help

At operating temperature.

Volts at idle:
Bank 1 Sensor 1: 0.4 V
Bank 1 Sensor 2: 0.09 V

Bank 2 Sensor 1: 0.73 V
Bank 2 Sensor 2: 0.12 V

Highest Reading:
Bank 1 Sensor 1: 0.9 V
Bank 1 Sensor 2: 1.0 V

Bank 2 Sensor 1: 1.3 V
Bank 2 Sensor 2: 0.9 V

Do these readings seem right?

I've been trying to track down why my DTC monitors for O2 sensor, catalyst, and evap are never ready even after 5000 miles of driving and also a random misfire p0300. I think this may be related?

Should the second sensor always be lower than the first? If so, it looks like there is an issue with bank 1.
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post #2 of 5 (permalink) Old 03-22-2017, 10:29 AM
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It always helps to list some info (year, model and mileage) on your Z when asking technical questions. Have you scanned your Z and pulled codes to determine if the diagnostic system has identified any O2 sensor issues?
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post #3 of 5 (permalink) Old 03-22-2017, 11:08 PM Thread Starter
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Originally Posted by dkmura View Post
It always helps to list some info (year, model and mileage) on your Z when asking technical questions. Have you scanned your Z and pulled codes to determine if the diagnostic system has identified any O2 sensor issues?
2004 350z 60k miles.

It shows no codes but they may have been disabled by a previous owner.
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post #4 of 5 (permalink) Old 03-23-2017, 11:53 AM
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Unless your Z is running on an alternative ECM, the diagnostic system should show all codes in memory. Even the ones that don't activate a CEL should be available, depending on what type of code reader you're using.
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post #5 of 5 (permalink) Old 03-24-2017, 01:08 PM
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My 07HR A/Fs (sensor 1) typically run at .4 on bank 1 and .9 on bank 2. I was also a little concerned/curious about this but so far it hasnt caused any issues and recently when I had it at Nissan they said all my O2 readings were ok. I plan to rotate the 2 sensors between banks in the next couple of days to see if the readings follow the sensors which might indicate a lazy sensor or stay with the banks which might indicate a rich mixture or bank 2.
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