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Old 10-12-2019, 03:26 AM   #1
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Join Date: Aug 2019
Location: Sydney
Posts: 112
My Ride: 2001 E46 325I Sedan
2001 325i O2 Sensor Voltages

Hi all,

Did a quick search but couldn't find what I was after.
Can someone supply me with Pre-Cat O2 sensor voltages at idle?
I have a rough running 2001 E46 325i and I feel it MIGHT be the O2 sensors.

For the record I have replaced the whole CCV system.
Replaced both intake boots.
New intake manifold gasket.
New DISA valve.
New throttle body gasket.
Replaced all vacuum lines and brake booster line.
Rebuilt VANOS.
Replaced oil filter housing gasket and VANOS oil supply line.
Replaced the valve cover gasket.
Cleaned MAF and ICV whilst out.
Replaced injector O rings and filters.
Replaced exhaust cam position sensor.
Replaced coolant temp sensor under manifold.

Did some other work not related to rough engine running also.

Engine holds vacuum nicely but idles rough, like it is missing on one cylinder and smells like it's running rich. Drives rough under 2500rpm.

I am about to read codes again but the O2 voltages seemed to fluctuate quite badly at idle. If someone can tell me what the voltages should be, and if should they be steady, I would greatly appreciate it.


Just realised this might be in the wrong section. Admins please move if required. My bad!

Last edited by Cibby600; 10-12-2019 at 03:31 AM. Reason: Wrong section??
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