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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > What might cause frequent O2 sensor failures?



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      01-11-2022, 10:38 AM   #1
Quick335XI
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What might cause frequent O2 sensor failures?

I had to replace my O2 sensors about 5 months ago, now another one has gone bad and I'm getting ECu codes and open loop issues. What sort of things might cause this?
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      01-13-2022, 11:10 AM   #2
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Anyone?
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      01-13-2022, 09:30 PM   #3
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Anyone?
If you burning oil and coolant o2 won't last long. Also engine running rich. Damaged during installed or manufacturer defect too.
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      01-13-2022, 09:58 PM   #4
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flame tune will cook them pretty quick
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      01-15-2022, 05:15 PM   #5
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Quote:
Originally Posted by feuer View Post
If you burning oil and coolant o2 won't last long. Also engine running rich. Damaged during installed or manufacturer defect too.
Ok thanks. Motor is rebuilt so hopefully shouldn’t be burning coolant or oil lol. We’ve been tuning it though so maybe rich sometimes.
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      01-15-2022, 11:02 PM   #6
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Ok thanks. Motor is rebuilt so hopefully shouldn’t be burning coolant or oil lol. We’ve been tuning it though so maybe rich sometimes.
Are you adding coolant or oil? Did you rebuild the engine yourself?
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      01-19-2022, 10:48 AM   #7
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Are you adding coolant or oil? Did you rebuild the engine yourself?
It was rebuilt by a shop in town

I'm having to add oil periodically because one of the turbo lines as a small leak

I created a thread a while back about having to add a little coolant over the course of a year and was told that's typical

Thanks
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      01-20-2022, 03:02 PM   #8
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Quote:
Originally Posted by Quick335XI View Post
It was rebuilt by a shop in town

I'm having to add oil periodically because one of the turbo lines as a small leak

I created a thread a while back about having to add a little coolant over the course of a year and was told that's typical

Thanks
Then is probably fueling that is causing the problem.
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