[BMVV3]

Hi everyone, my car currently has a rattling noise coming from the engine at low RPM. It all started when the half check engine light appeared after I started the engine. After that, I quickly stopped the car and used the Carly for BMW app to scan for codes. From the description of the codes, i decided to park the car and clean the VANOS solenoids. With some luck, I managed to clear code 2A82, but code 2A7C still appears. The rattle noise still persists, and only occurs at low rpm's, once I press the pedal it seems to disappear. The car is a 2011 BMW 328i n51 w/ xdrive, currently has 62k miles and oil changes have been done every 5k miles. Any tips on what to do next would help a lot, thank you.

Codes:
Intake Vanos variable cam control test: 2A82
Intake, cold start: 2A7C; no description as to what can be the cause of this code

I took a video of how the car sounds.

Video while pressing the pedal

[N54_e90]

Definitely seems vanos related, may need to replace a solenoid unfortunately.

[JuniorB]

Could be a weak valvtronic motor, or a worn cam ledge.

[frisbeeguy]

Replace in order and see if the problem is solved before replacing the next item:
1) Intake VANOS Solenoid
2) Clean Exhaust VANOS Solenoid. Replace if you want to
3) Replace both non-return (check) valves
4) Replace Oxygen sensor after the catyletic converter
5) Check Bearing ledge condition and determine if there is a groove.

Ideally: Do not clear the fault codes. Download and setup ISTA-D, and do a full scan. Then click "calculate a test plan" and ISTA will tell you what to check.

[BMVV3]

Thank you everyone, I will start by changing the Vanos Solenoids. Once I do that if nothing changes, I will most likely take it to my local Indy shop so they can help diagnose the issue. Unfortunately I cleared the codes since I did not have access to ISTA-D. Hopefully it is something that a simple valve or solenoid can resolve *fingers crossed*.

[Pilarskica]

It is the AC compressor Pulley. I pulled the belt off and the noise was gone. I put a shorter belt on and bypassed the AC compressor and the noise is gone. Now I have to decide how I want to fix the compressor pulley.

[Z3SpdDmn]

Is there an update on what the issue was in this case? I seem to have a similar sound, but its intermittent. It comes on, but then will go away maybe 10 minutes later, or after a restart sometimes. I don't have a CEL or any codes, which is weird.