E46Fanatics - View Single Post - OBD Fusion & Oil Temperature
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Old 02-15-2020, 01:19 PM   #12
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Join Date: Jul 2016
Location: SF Bay Area, CA
Posts: 1,627
My Ride: 2004 325i automagic
Originally Posted by BIC_BAWS View Post
I see your edit, I believe red/yellow oil light is just level sensor.

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Well, there is an actual oil level sensor in the bottom of oil pan that activates the yellow oil lamp to indicate oil level. The red oil light however is based on pressure only (in all cars as far as I know), and that is activated by the oil pressure switch (#12) on the oil filter housing. So there are two different "sensors" involved here.

Pressure sensor vs switch is splitting hairs a little, but that is what confused me at first when Toby said there was no oil pressure sensor. Turns out he is correct: the car knows if oil pressure is below a specific threshold, but it doesn't know specifically what that pressure is.

Like you said, it would be great to see actual oil pressure on the track. I wonder if it fluctuates as you go through turns.

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20mm OD x 12mm ID x 4mm W : Viton O-Ring
3/4" OD x 1/2"ID x 1/16" Thick : Thrust Bearing/Washer
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