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      09-17-2012, 08:23 PM   #9
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Quote:
Originally Posted by af908 View Post
Thanks mike,

What should I be looking for specifically? A frayed wire? Or is it something not so obvious? I say this because I would assume a frayed wire would warrant an o2 replacement anyways, no?

It seems strange that my o2 sensor went already, the car only has 36k miles on it
I've seen a few of them go. Usually it's the heater element/wire though.

It depends where the frayed wire is. It could be on the loom connected to the o2 sensor, or it might have somehow frayed above where it connects to the wires running back to the DME.

In my case I had a check engine light about 6 months ago due to an o2 sensor fault. It wound up being some debris the ground that happened to fray the wire underneath the car. After replacing it I've had 0 issues.

Usually these o2 sensor related errors are the sensor themselves. It's rarely the wiring unless there are extenuating circumstances.
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