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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-20-2017, 07:25 AM   #1
IanMcG
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Join Date: Feb 2017
Location: Ireland
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My Ride: 2001 E46 318 N42B20
p0130, and oil leaking onto O2 sensor connector

Hi,
Can anybody tell me if oil leaking onto the 02 sensor connector block could cause a short-circuit? I was under the impression the connection was water-proof?

I was expecting to find the connectors near the top of the engine, but there's nothing there, they are near the oil sump

Last edited by IanMcG; 03-07-2017 at 04:55 AM. Reason: answered some of my own questions.
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Old 02-22-2017, 03:35 AM   #2
IanMcG
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quick update
A guy from pelican parts says it's unlikely the oil will cause issues...my local mechanic agrees, my car had been misfiring before the 02 sensor code appeared, and he thinks its more likely that the misfires have affected the sensors.
The car's due a service anyway, so gonna start with new spark-plugs, see if anything changes.
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Old 02-27-2017, 01:23 AM   #3
IanMcG
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update:
new plugs haven't made any difference...I ordered a new 02 sensor which should arrive today, but the weather is pretty bad so not gonna get a chance to swap it out for a few days.
The misfires seem to be getting worse, so hopefully this will fix it
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Old 03-07-2017, 04:52 AM   #4
IanMcG
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So I changed the precat 02 sensor on friday, and the car ran beautifully...until sunday

diagnostic codes are the same as before the sensor change
P1204 (not sure what this is)
P1205 (not sure what this is)
P0130 (O2 sensor circuit B1S1)
P0150 (O2 sensor circuit B2S1)
P1341 (Multiple Cylinder Misfire With Fuel Cut-off)
P1343 Misfire Cylinder 1 With Fuel Cut-off
P1349 Misfire Cylinder 4 With Fuel Cut-off

Before I put the new sensor in, clearing the codes had no effect, and the codes would come back after one or two trips.
After I put the new sensor in, the car ran like new, and I drove a lot on Friday and Saturday...then on Sunday is started misfiring again.

My guess is that either the oil leaking onto the connection is causing a problem, or else the other section of wiring (not the section that I replaced with the sensor) might have a problem, and that just by messing with the sensor wiring I temporarily fixed it ???
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Old 03-16-2017, 03:38 AM   #5
IanMcG
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So I disconnected the sensor again, wiped all around and inside the connector block, and cleared the codes...car is running like new again ( for about 2 days anyway...we'll see if anything changes)
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Old 03-16-2017, 07:01 AM   #6
markusmarkus
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Sounds like you're due for a valve cover gasket change. Buy a gasket and 15 (?) grommets. Make sure you buy OEM parts or you'll be redoing the job in 6 months. Also, buy a tube of high temperature RTV. There are YouTube DIYs for this.
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Old 03-16-2017, 09:07 AM   #7
IanMcG
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Hi Markus,
Thanks for the joining me...I was beginning to feel like a crazy person talking to myself in here

Can I ask, what makes you say that?
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Old 03-17-2017, 06:20 AM   #8
markusmarkus
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The valve cover gasket tends to leak. It's just one if the "features" of the M5; engine. On the exhaust side of the engine the only place that can leak oil is the valve cover gasket.
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