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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-23-2011, 04:47 AM
FirstVert FirstVert is offline
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Location: Houston, TX
 
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Mein Auto: 2004 BMW 325Ci
Service Engine Soon Light

Hi all,

My engine light is on for a few days and off for a day and on again etc. At first I thought it may have to do with the cold weather because each time it was off, the temp was 70 or better. But since the temp here in Houston have been consistently in the 60's I didn't think it has to do with the temp anymore.

I brought the car to Autozone to read and it said the precat sensor, I took my car to an Indy and he told me he's not sure and it could be $1400 or more since there is "obvious attempt to fix this, based on the wrench marks on the part blah blah" but he test drove the car and he said everything is normal. So, I took the car and left and it's been a few weeks but the light stayed on permanent now.

The car is operating normally. I get 23 MPG and I notice no adversed effects in the performance.

My questions then:

Could it be possible that a wire is loose somewhere that causes the SES light to be on?

If indeed the precat sensor is going, can I continue to drive until it's gone then replace?

Where else could I look to solve this?

While I'm asking for help I may ask this question as well, my car is a 04 but only has 34k
on it. Should I change out the spark plugs?

Thank you so much for your inputs.

FirstVert
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  #2  
Old 03-23-2011, 07:22 AM
jcourcoul jcourcoul is offline
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Mein Auto: 2006 325Ci
Care to share with the forum the specific code numbers read when it was scanned?
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  #3  
Old 03-23-2011, 11:25 AM
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dj330Ci dj330Ci is offline
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34k would be premature for o2 sensors but possible I suppose. The pre-cats normally go at around 100k. I think the spark plugs are fine at 34k. Definitely get those codes.
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  #4  
Old 03-23-2011, 04:19 PM
FirstVert FirstVert is offline
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Mein Auto: 2004 BMW 325Ci
Hi,

Sorry I misinformed you, I stopped by Advanced Auto just now and the code read P0012, the description is Intake Cam Position, over-retarded (yeah like me )

So now my question is can it be adjusted or has to be replaced? If replace is it a DIY?

Thanks again and sorry for the confusion.

FirstVert
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  #5  
Old 03-24-2011, 10:09 AM
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ECSTuning ECSTuning is offline
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Location: Wadsworth, Ohio
 
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Mein Auto: Hover Car on Wheels
Can't go wrong with PEAKE!

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  #6  
Old 03-24-2011, 01:40 PM
Big "J" Big "J" is offline
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Camshaft Position sensors are easy to replace. It's in the WIKI link at the top of the page. Or you can do a search for the code you're getting and read what others have done to correct it. Good Luck!
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  #7  
Old 03-25-2011, 03:43 AM
bmw2001-325ci bmw2001-325ci is offline
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Mein Auto: 325ci
for the intake sensor, you'll need a 32mm wrench, a 12mm wrench, a string, dexterous fingers and a good back.

Don't forget to reconnect the MAF sensor!
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  #8  
Old 03-25-2011, 03:39 PM
FirstVert FirstVert is offline
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Thanks for the tips on tools...
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