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      11-09-2014, 03:55 PM   #1
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N54 oil pressure too low light; 2A7C and 3100 codes

hello there. Two days ago i went to start my car on a cold morning and got a oil pressure too low light and half engine light. Turned the engine off and restarted it .. everything was fin no light no nothing .. car drive just like usual.
After parking it for about 8 hours went to start it again and BAM! same s*it happens oil pressure too low and half engine light. pulled out the codes and it came up as 2A7C (no description found) and 3100. left the car like that overnight and the next day, i pulled the vanos solenoids, cleaned them and changed the oil and filter hoping it would fix my problem but no luck.
next step is to replace the vanos solenoids which i will do tomorrow since the 2A7C is a vanos related code if i'm right and the codes disappeared the other day.

i was hoping somebody had a similar issue or can contribute with anything and if a faulty vanos solenoid can cause the low oil pressure light to come up.

My car has 118000KM and i have JB4, DP's, DCI and a muffler delete.
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      11-09-2014, 06:45 PM   #2
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Replace both solenoids, change oil, and reset adaptations. You should be good after that. If not, next step is cam bearing ledge, but this is rare.
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      11-09-2014, 07:10 PM   #3
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Yes, that's the plan for tomorrow. Any ideas about the low oil pressure light ?
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      11-09-2014, 10:02 PM   #4
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Any inputs on the oil pressure too low light ?
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      11-10-2014, 10:30 AM   #5
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Anyone ?
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      11-10-2014, 02:09 PM   #6
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Severe gasket leak possibly? Check VCG and OFHG and also oil feed lines to turbos
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      11-10-2014, 03:16 PM   #7
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Low oil pressure is bad. Has no relation to an oil leak, vanos solonoids etc. Low oil pressure is caused by either a failing oil pump or crankshaft bearing wear. Drain the oil into a pan. If it is sparkly, motor is done.
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      11-10-2014, 03:35 PM   #8
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Quote:
Originally Posted by David1 View Post
Low oil pressure is bad. Has no relation to an oil leak, vanos solonoids etc. Low oil pressure is caused by either a failing oil pump or crankshaft bearing wear. Drain the oil into a pan. If it is sparkly, motor is done.
I just changed my oil and filter too.. Oil seems to be just like normal .. Black no metal shaving or anything of the sort. I'm also suspecting the oil pressure control valve.
And what about the 2A7C code I'm getting ? Does that just mean that the vanos is just not getting enough oil pressure and throwing that code ?
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      11-10-2014, 05:14 PM   #9
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Low oil pressure will through vanos codes since there won't be enough oil pressure to opperate. Did you install the small O ring when you changed the oil filter? Improper O ring/filter install can give you this symptom.
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      11-10-2014, 05:31 PM   #10
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Quote:
Originally Posted by David1 View Post
Low oil pressure will through vanos codes since there won't be enough oil pressure to opperate. Did you install the small O ring when you changed the oil filter? Improper O ring/filter install can give you this symptom.
Yea, I did install all the rings that came with the oil filter ( small O and big one )
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      11-11-2014, 07:05 PM   #11
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has anyone has an oil pressure too low light in his N54 at all ?
today i just pulled out a misfiring code and it was a bad spark plug. The car starts but has a really rough idle and running rich ..
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      11-11-2014, 07:22 PM   #12
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What oil brand and weight are you running?

Also, what was the low temperature reading overnight?
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      11-11-2014, 07:34 PM   #13
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Quote:
Originally Posted by CHECKERED View Post
What oil brand and weight are you running?

Also, what was the low temperature reading overnight?
Oil is Castrol 0w30, and the temperature is 19 Fahrenheit.
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      11-12-2014, 03:41 PM   #14
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Quote:
Originally Posted by E90 M335i
has anyone has an oil pressure too low light in his N54 at all ?
today i just pulled out a misfiring code and it was a bad spark plug. The car starts but has a really rough idle and running rich ..
I didn't know we even had a light specifically for 'oil pressure too low"
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      11-12-2014, 04:54 PM   #15
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Quote:
Originally Posted by Jklad View Post
I didn't know we even had a light specifically for 'oil pressure too low"
It doesn't throw a code but it's in the idrive and the cluster.
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      11-12-2014, 05:32 PM   #16
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I'd clean the vanos with compressed air. Also check your oil filter cap make sure the tip that goes in the center is not broken.(where the small oring goes). I read that you are replacing the vanos, how did that go? Oil pressure sensors rarely go bad but if you'd like to change it its $14 at autozone and $24 at the dealership. Any other codes?
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      11-12-2014, 07:18 PM   #17
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Quote:
Originally Posted by Supra2k6 View Post
I'd clean the vanos with compressed air. Also check your oil filter cap make sure the tip that goes in the center is not broken.(where the small oring goes). I read that you are replacing the vanos, how did that go? Oil pressure sensors rarely go bad but if you'd like to change it its $14 at autozone and $24 at the dealership. Any other codes?
I'm actually just leaving the dealer with the new solenoids. I'm getting a 2A7C code and the 3100 related to limp mode.
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      11-12-2014, 07:44 PM   #18
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Installed am assuming. Check your oil cap otherwise might be cam ledges
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      11-12-2014, 10:53 PM   #19
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Little update on my problem. So went to the dealer, got a new solenoid and went back to my car and replaced it. Car strarts nothing changed appart from that I no longer had a 2A7C code but a 2A98. I let the car run for a bit and held the throttle at 900rpm. After 8-10 min car holds idle by itself but I still had the half engine light on. Stopped the engine and restarted and poof no codes no nothing car runs good took it for a good long drive and everything is good. So from what I figured so far my problem is only when the oil is cold, once it warms up a but the car runs like magic. Any insights ?
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      11-12-2014, 10:56 PM   #20
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Quote:
Originally Posted by E90 M335i View Post
Little update on my problem. So went to the dealer, got a new solenoid and went back to my car and replaced it. Car strarts nothing changed appart from that I no longer had a 2A7C code but a 2A98. I let the car run for a bit and held the throttle at 900rpm. After 8-10 min car holds idle by itself but I still had the half engine light on. Stopped the engine and restarted and poof no codes no nothing car runs good took it for a good long drive and everything is good. So from what I figured so far my problem is only when the oil is cold, once it warms up a but the car runs like magic. Any insights ?
Never had a similar problem and I've used the car at -47. Maybe the oil pump or the control valve as you said you changed the pressure sensor. If it was me I would tee in a mechanical gauge to the oil sensor port to get an idea of what your pressures are and compare to the dme value.
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      11-12-2014, 11:02 PM   #21
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maybe a crankshaft sensor. did you replace both vanos or just one. Cold start the oil is thicker flows slower when it warms it thins out. so no more low oil pressure?


2A98:
2A98 Crank shaft - inlet camshaft, correlation
Error will cause a warning light
Error is not currently present
Test conditions have not been completed
Short circuit or signal interruption
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      11-13-2014, 12:36 AM   #22
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Quote:
Originally Posted by Supra2k6 View Post
maybe a crankshaft sensor. did you replace both vanos or just one. Cold start the oil is thicker flows slower when it warms it thins out. so no more low oil pressure?


2A98:
2A98 Crank shaft - inlet camshaft, correlation
Error will cause a warning light
Error is not currently present
Test conditions have not been completed
Short circuit or signal interruption
I replaced just the intake one. I was thinking about the crankshaft sensor too. Because at this stage it looks like it either the oil isn't good or one of the sensors is screwing s*it up.
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