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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 10-20-2015, 11:35 AM
jmmdm2 jmmdm2 is offline
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Location: Connecticut
 
Join Date: Oct 2015
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Mein Auto: 2007 525xi
Oil pressure sensor unplugged but no code?

My first post and it's a noob question... not the way I wanted to start.

The vehicle is a 2007 525xi with 108k. Runs well though I'm not used to a BMW so I couldn't identify any nuances related to performance issues.

I happened to notice there was a sensor (located by the oil filter housing/cover) which had no harness/wire attached. Based on the fact that the car informs me if I forget to apply deodorant, I assumed that there was no way an unplugged sensor would not result in a malfunction.

After a brief conversation with a seasoned BMW owner at work, I popped the engine cover to see if the harness was tucked up out of view. It was. If it was an oversight by a mechanic, I'd expect the harness to be hanging next to the sensor, not neatly tucked up under the engine cover.

Am I correct in assuming this is the oil pressure sending unit? Could it be an oil quality sensor? I'm searching but if anyone has any suggestions... I placed a call to the dealership but haven't heard back from them yet. All I have from them is "we'll go through the entire car and take care of what it needs". That was when I purchased the car, seems like they missed something.
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  #2  
Old 10-20-2015, 12:32 PM
Alika808 Alika808 is offline
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Location: 21 18' N, 157 51' W
 
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Welcome to Bimmerfest.

If you are talking about item #12, yes that's is correct. It's oil pressure sending sensor. This is kind of odd, if the connector unplug then you should have display indications. Do you notice all the display at the instrument light up?

http://bmwfans.info/parts-catalog/E6...eat_exchanger/
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  #3  
Old 10-20-2015, 01:18 PM
jmmdm2 jmmdm2 is offline
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Location: Connecticut
 
Join Date: Oct 2015
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Mein Auto: 2007 525xi
Thank you for the welcome and the reply.

Yes, it's #12.

On the day I picked up the vehicle, the low oil indicator light came in in the cluster (just as I arrived home and parked). The audible tone alerted me of the issue as well. Next morning, the low oil indicator came on (highway speed) as I was headed for the auto parts store for oil. This time the message stated further engine operation could result in damage so I parked it and called the dealer. They sent a driver with oil and took it back to the dealership to analyze the problem. They couldn't understand why it would sense low oil after they just changed the oil before I picked it up.

I was told that the computer needed to be reset and that was the reason for sensing low oil. I didn't want to be rude at the time but I am fairly certain that the oil level sensor has no way of being reset and it should be a real time monitor type of sensor regardless of any other measurable parameters. My assumption was that the system is extremely sensitive to oil level and they hadn't topped off the oil after the oil change.

Now I wonder if there's more going on. The sensor could have been disconnected by the previous owner or the dealership but again, why no code? It's a stretch to consider the following... I hope I don't find a resistor wired into the harness at some point... assuming that would fool the computer. I've noticed that the oil life is still @ 14,000 miles and hasn't budged since they reset the computer.

Should be an interesting drive home as I haven't driven the vehicle since plugging in the sensor harness.
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  #4  
Old 10-20-2015, 01:52 PM
Alika808 Alika808 is offline
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Location: 21 18' N, 157 51' W
 
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Did the low oil warning came back? It should give's you warning also for low oil pressure. I know that if you have no oil pressure, the engine shut but since it's running well. I am wondering if the low oil indication could be the no oil pressure too? The way to find out is to disconnect again and if the low oil indication comes back. I am thinking maybe when the technician replaced the oil filter, somehow he disconnected the plug for some reasons but not suppose to.
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  #5  
Old 10-20-2015, 02:23 PM
jmmdm2 jmmdm2 is offline
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Location: Connecticut
 
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Mein Auto: 2007 525xi
I really appreciate the advice, thank you!

The low oil indicator message has not come back since the dealership serviced the car about 1.5 months ago. I did not discover the disconnected sensor right away though... just found it a couple days ago. I've checked the oil several times via iDrive and it's at MAX each time.

Spoke to the service manager. They want me to bring it back in... should be interesting.
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  #6  
Old 10-20-2015, 02:30 PM
Alika808 Alika808 is offline
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Location: 21 18' N, 157 51' W
 
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I am just wondering if your maintenance record that they replaced the oil filter housing gasket recently? If so, that could be they forgot to reconnected the plug.
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  #7  
Old 10-20-2015, 04:38 PM
jmmdm2 jmmdm2 is offline
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Location: Connecticut
 
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Yes, this service was performed when I purchased the car (just found the record). The printout of services includes "replaced oil filter housing adapter gasket". It makes sense that the sensor was unplugged but very odd the computer did not detect that fault.
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  #8  
Old 10-20-2015, 04:54 PM
Alika808 Alika808 is offline
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Could you try to do this, to check all the cluster display works. I think the test is #2.

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  #9  
Old 10-20-2015, 04:56 PM
Alika808 Alika808 is offline
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Location: 21 18' N, 157 51' W
 
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Refer with the car owner's manual which is for the oil pressure indication.
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  #10  
Old 10-20-2015, 09:20 PM
jmmdm2 jmmdm2 is offline
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Location: Connecticut
 
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I was able to access the menu and perform the diagnostic test. All warning lamps appear to function properly. It's nice to be able to see the engine temp in real time while in that menu.

I did not see a warning light for low oil pressure, I'm guessing it would be conveyed via the iDrive system rather than a warning lamp.

I hope to have some answers from the dealer sometime this week. Thanks again for you help.
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