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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Cause for oxygen sensor failure



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      06-07-2010, 04:15 PM   #1
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Cause for oxygen sensor failure

My car has 36000 miles. It started erratically recently. Finally got a check engine light today and the code is P112D. Dealer appointment Wednesday.

Is this common on N52? Will it be a every 2 years maintenance item? What can contribute to make it fail, other than gas obviously? My mpg dropped a bit recently (from 21-22 to 19-20).... can it be the reason of it?
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      06-07-2010, 05:00 PM   #2
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Quote:
Originally Posted by Saintor View Post
My car has 36000 miles. It started erratically recently. Finally got a check engine light today and the code is P112D. Dealer appointment Wednesday.

Is this common on N52? Will it be a every 2 years maintenance item? What can contribute to make it fail, other than gas obviously? My mpg dropped a bit recently (from 21-22 to 19-20).... can it be the reason of it?
Your aftermarket intake ?
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      06-07-2010, 05:40 PM   #3
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I don't have an aftermarket intake, just the BMW Performance Exhaust and a PBX.
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      06-08-2010, 08:35 AM   #4
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O2 sensors go bad for all manufacturers and is not uncommon.
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      06-08-2010, 10:57 AM   #5
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I cleaned mine at 50000 miles
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      06-08-2010, 01:16 PM   #6
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I had a mouse chew through the wires on one of my O2 sensors in my truck a month ago. I might be that. Not sure about Canada, but most US insurance companies cover rodent damage under comprehensive insurance.
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      06-09-2010, 08:33 AM   #7
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Quote:
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I don't have an aftermarket intake, just the BMW Performance Exhaust and a PBX.
naaaa - your aftermarket chip won't affect anything. BMW had extra ink so they just wasted it by randomly telling you that a chip will cause you warranty woes.

Please post back and let us how much how much you paid for the repair.
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      06-09-2010, 04:31 PM   #8
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So far they worked on coils and spark plugs and rejected the idea of a faulty O2 sensor. They asked to keep the car overnight to have another a cold start.
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      06-10-2010, 03:34 PM   #9
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Well they dismissed it too quickly because it turned out to be.... an oxygen sensor (11787558073).
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