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2001 330xi 208k
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145 Posts
Discussion Starter · #1 ·
Motor vehicle Hood Vehicle Automotive design Automotive exterior

I’m trying to replace my sensor and notice there’s a bit of oil on it.

Heating up the manifold as so far it’s not budging.

Wondering where the oil could be coming from.
 

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03/2002 330xi
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856 Posts
it is absolutely unequivocally your valve cover or gasket. The covers have been known to morph (despite being plastic) / crack and leak downward that way. Theres nothing else that would cause this without being evident elsewhere
 

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it is absolutely unequivocally your valve cover or gasket. The covers have been known to morph (despite being plastic) / crack and leak downward that way. Theres nothing else that would cause this without being evident elsewhere
I Think So. he should double check this, as far as i know there are 3 main reasons,
1. The gasket is aging (broken/poor quality)
2. The screw is not tightened properly
3. the lid is oval (no flat surface, often encountered if the car was be keep drive for a long time)
 

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2001 330xi 208k
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145 Posts
Discussion Starter · #11 ·
Since OP said he already replaced the VCG, but he didn’t say that he cleaned everything once he was done. Could be residual left after the VCG replacement.
Someone actually read the posts. :D

And I’ve wiped the area clean so if there’s fresh leaks I should be able to find them.

I felt around the area of the valve cover gasket and my hand (glove) came away clean. I’ll continue to monitor.
 

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03/2002 330xi
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856 Posts
Dave your thread makes no sense.

Oil on O2 sensor
That's the title, Oil on the o2 sensors? Ok so what?

Wondering where the oil could be coming from.
The valve cover, the only place that can replicate a leak like that short of a rod going to the moon, even then it's a stretch it would get over and up on the heat shield.
Were you needing suggestions on breaking free the seized, oil covered O2?

Is this a blog entry or a solicitation for help? - I'm asking because you're giving people flack for answering your original question
Thanks.
 

· Registered
2001 330xi 208k
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145 Posts
Discussion Starter · #20 ·
Dave your thread makes no sense.

Oil on O2 sensor
That's the title, Oil on the o2 sensors? Ok so what?



The valve cover, the only place that can replicate a leak like that short of a rod going to the moon, even then it's a stretch it would get over and up on the heat shield.
Were you needing suggestions on breaking free the seized, oil covered O2?

Is this a blog entry or a solicitation for help? - I'm asking because you're giving people flack for answering your original question
Thanks.
The flack is for answering without bothering to see if it had been answered.

And yes, the thread got intermixed with an O2 sensor replacement in the middle.
 
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