O2 Sensor Data, can you tell me what this means?

Steenos · 05-31-2015, 01:45 PM

Trying a different set of cats on my car and I'm getting a CEL. I can see where the problem is in the data but I don't know how to translate the data cause I'm not a mechanic. Or I'm just talking out my ass. Anyone know what it should properly read?

StickMon · 06-01-2015, 07:23 PM

I can read these off mine using my iPod.
I'll check them when I get home and let you know.
Off the top of my head, they look about right.

StickMon · 06-01-2015, 09:33 PM

It looks like I'm running rich on a hot engine at idle.
S12, S22: 0.755 - 0.770 V (they bob around a little)
I think they were both at 0.435 when I first started the car.
S11, S21: 2.00 V (don't bob around much)
S11, S21 mA: +/- 0.010 (they bob around also)

IIRC, S12 and S22 are the pre-cat narrow band and should optimally be 0.450.
S11 and S21 are the post cat wide band. The current should bob slightly around 0 as the DME adjusts it to maintain the voltage at 2.00 V.

05-31-2015, 01:45 PM	#1
Steenos Lieutenant 56 Rep 588 Posts Drives: 2007 Z4M Coupe Join Date: Feb 2011 Location: Tennessee iTrader: (0) Garage List 2021 BMW M240i [0.00] 2007 M Coupe [0.00]	O2 Sensor Data, can you tell me what this means? Trying a different set of cats on my car and I'm getting a CEL. I can see where the problem is in the data but I don't know how to translate the data cause I'm not a mechanic. Or I'm just talking out my ass. Anyone know what it should properly read? __________________ 2021 m240i on order
	Appreciate 0 Tweet Quote

06-01-2015, 07:23 PM	#2
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	I can read these off mine using my iPod. I'll check them when I get home and let you know. Off the top of my head, they look about right. __________________ Warning: May contain traces of nuts.
	Appreciate 0 Quote

06-01-2015, 09:33 PM	#3
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	It looks like I'm running rich on a hot engine at idle. S12, S22: 0.755 - 0.770 V (they bob around a little) I think they were both at 0.435 when I first started the car. S11, S21: 2.00 V (don't bob around much) S11, S21 mA: +/- 0.010 (they bob around also) IIRC, S12 and S22 are the pre-cat narrow band and should optimally be 0.450. S11 and S21 are the post cat wide band. The current should bob slightly around 0 as the DME adjusts it to maintain the voltage at 2.00 V. __________________ Warning: May contain traces of nuts.
	Appreciate 0 Quote