Oxygen sensor PID questions

[JamesD]

Hello, Mike!

As a reply to another post regarding oxygen sensor identification, you wrote,

11 is driver side front, 12 is pass side front, 21 is driver side rear, 22 is pass side rear.

The four PIDs I'm asking about are:

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PID 	Description						Heading		Sub		Units
65549	Bank 1 - Sensor 1 Oxygen Output Voltage	Oxygen Sensors	O2S11 - SAE	B1S1 MV		MV
65553	Bank 1 - Sensor 2 Oxygen Output Voltage	Oxygen Sensors	O2S12 - SAE	O2S12 - SAE	MV
65565	Bank 2 - Sensor 1 Oxygen Output Voltage	Oxygen Sensors	O2S21 - SAE	B2S1 MV		MV
65569	Bank 2 - Sensor 2 Oxygen Output Voltage	Oxygen Sensors	O2S22 - SAE	O2S22 - SAE	MV

I have a trouble code showing a bad oxygen sensor, and I'd like to confirm that you regard bank 1 of the oxygen sensors as the pair upstream of the catalytic converters, and bank 2 as the downstream pair. I added numbers to this drawing to illustrate my interpretation of your statement.

O2 sensors DS.png

The reason I ask is that the Factory Service Manual I have access to describes the oxygen sensors in the wiring diagram differently.

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Location	FSM	DiabloSport
Left Front	O2 1/1	11
Left Rear	O2 1/2	21
Right Front	O2 2/1	12
Right Rear	O2 2/2	22

You can see my confusion.

Also, the measurement units for all four PIDs are shown as mv, and three of them read in mv. However, PID 65553 reads in V when displayed. This makes numbers on certain analog displays unusable. Bear in mind that the one in the center is reading 0.725 mv. an exceedingly small number. The outer ring display is just rounding the numbers to digits with no decimal places, again, because it's showing volts instead of millivolts.

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A quick fix, I'm sure.

Best regards,
James

[mikel]

the info from my post you quoted is not correct.

bank 1 is driver side, bank 2 is passenger side

1/1 indicates bank one (driver side) / sensor one (front sensor)

2/2 would be passenger side/rear sensor, etc.


Thanks

[JamesD]

Thank you, that helps a lot!

James