[iverson03tj]

Hey yall. I could really use your help with troubleshooting this one. Just bought this car with 174k km and fixed a few things listed below.

Got this code on ISTA. 1C3102 - Engine-oil pressure sensor, plausbility : Pressure too low before engine start

- Replaced the Oil Pressure sensor
- Replaced, ignition coils, spark plugs, oil filter & cooler housing gasket, belt tensioner and both pulleys.
- changed the oil filter cap to a URO metal one with a metal inner filter. (I heard that this can cause the oil pressure code, so will try to change it back to the plastic oil filter cap tomorrow)
- reset adaptation ran well but a slight hesitation
- I did the priming procedure and coolant purge procedure

Details:
Oil temp 102c - 105c
Oil pressure at Idle = 1600 hPa / 1.6 Bars / 23 psi
oil pressure during driving = is 4k hPa @ 1600 RPM to around 7k hPa @6k RPM

[iverson03tj]

On another note:

the Previous owner somehow stripped the oil pan drain plug -_-

So i am installing a Helicoil to it.

RealOEM.com It shows the drain plug as M12x16

Does the 16 stand for 16mm and does it mean its 16mm in height of the entire bolt or just the thread?


I googled it and it says that the drain plug is M12 x1.5 thread

[iverson03tj]

Ref: oil filter cap to a URO metal one with a metal inner filter.
This is the one i used
https://www.ecstuning.com/b-uro-prem...27525334prm~u/

[Conserve]

1). 16mm is length of threads. full specs Oil Drain Plug With (12 X 1.5 X 16 mm)
2). Throw that URO oil filter cap with a metal inner filter in neighbor's pool and go back to original. You and your engine will be lot happier.

[iverson03tj]

Originally Posted by Conserve

1). 16mm is length of threads. full specs Oil Drain Plug With (12 X 1.5 X 16 mm)
2). Throw that URO oil filter cap with a metal inner filter in neighbor's pool and go back to original. You and your engine will be lot happier.

Thank you for the suggestion, I swapped the oil filter cap back to stock, still the same issue exists.

[Conserve]

In OP you said changed oil filter cap & metal inner filter. Last post swapped the oil filter cap back to stock. If I follow you correctly you must of remove that center piece of cap and installed just the cap? How about replacing inner filter unit back to stock?

[iverson03tj]

Originally Posted by Conserve

In OP you said changed oil filter cap & metal inner filter. Last post swapped the oil filter cap back to stock. If I follow you correctly you must of remove that center piece of cap and installed just the cap? How about replacing inner filter unit back to stock?

I replaced the inner filter as well.
Also while combing through ISTA, I see there is some sort of oil pressure control valve. No 11

https://www.realoem.com/bmw/enUS/sho...diagId=11_4447

https://www.fcpeuro.com/products/bmw...ve-11417622768

Could this be the reason why the oil pressure isn't high at start up?

[Conserve]

You maybe on into something.

https://f10.5post.com/forums/showthread.php?t=1937902

[iverson03tj]

Originally Posted by Conserve

You maybe on into something.

https://f10.5post.com/forums/showthread.php?t=1937902

Thank you very much! Still struggling with this

[iverson03tj]

Originally Posted by Conserve

You maybe on into something.

https://f10.5post.com/forums/showthread.php?t=1937902

I have tried both of these methods, bought a new oil control solenoid and i even change the oil filter from a URO alluminum one with an aluminum core (the part in the middle of the oil filter) to a oem plastic cover and plastic core.
Even swapped out the oil pressure switch... Still have the same issue, but its only throwing a code for
1C3102 - Engine-oil pressure sensor, plausbility : Pressure too low before engine start

Nothing else. I would like to no have to pull the oil pan on my driveway to find out if my oil pump is good if it doesnt really impact anything other than the oil pressure before engine start

[Surly73]

Never worked on this code personally. But... my first reaction is that I feel like you're chasing stuff for a different problem.

You don't log a low oil pressure code, or any other symptoms. You log a PLAUSIBILITY code. The oil pressure read is not low, it is implausibly low. Before the engine is even running. I think I reference I saw says that the DME is inferring oil pressure lower than atmospheric pressure. What is implausibly low oil pressure before the engine is even running? (Unless the code means that it's read while the engine is cranking on the starter but before it is running. I don't think a code is logged for that, or I would get that code briefly every time I changed the oil filter).

Since you already replaced the sensor, I would personally start checking wiring. I would not expect this to be clogged VANOS solenoid screens and stuff like that.

And I agree with whoever told you to go back to genuine oil filter cap.

Are your oil pressure readings in the first post from a mechanical gauge, or from the same sensor that you already changed?

[iverson03tj]

Is the atmospheric pressure measured using the oil pressure sensor?




BMW F10 ECU Repair, Internal Atmospheric Pressure Sensor

https://www.youtube.com/watch?v=dsjlBJB2lRw

Could this be causing the issue?

Originally Posted by Surly73

Never worked on this code personally. But... my first reaction is that I feel like you're chasing stuff for a different problem.

You don't log a low oil pressure code, or any other symptoms. You log a PLAUSIBILITY code. The oil pressure read is not low, it is implausibly low. Before the engine is even running. I think I reference I saw says that the DME is inferring oil pressure lower than atmospheric pressure. What is implausibly low oil pressure before the engine is even running? (Unless the code means that it's read while the engine is cranking on the starter but before it is running. I don't think a code is logged for that, or I would get that code briefly every time I changed the oil filter).

Since you already replaced the sensor, I would personally start checking wiring. I would not expect this to be clogged VANOS solenoid screens and stuff like that.

And I agree with whoever told you to go back to genuine oil filter cap.

Are your oil pressure readings in the first post from a mechanical gauge, or from the same sensor that you already changed?