[4renObject]

My cars been sitting at a bodyshop lot for 4 - 5 months since the end of Feb without being driven.
I'm getting a clacking/rattling noise whenever I open the door(wake the car up) like in this video (not mine): https://youtu.be/hSaaq_0W2z4

Could these codes/noises have to do with low battery? "rattling noise from a relay. I changed my car battery and the problem went away. The reason was that my car battery wasn’t supplying adequate voltage to certain modules and relays"

- Could it be a failed Valvetronic Servo Motor?
- Doubtful that it's a frozen eccentric shaft.

Car starts up and drives fine, but I read that it'll switch over to the throttle body instead of using Valvetronic if it faces an issue.

Any help would be greatly appreciated! Thanks in advance.

Had these codes initially (along with a CEL):

- DME active codes -
118001 - Mixture control: Fuel-air mixture too lean.
118401 - Mixture control: Fuel-air mixture too lean, large deviation.
119304 - Rail pressure sensor, plausibility: Pressure too high before engine start.
128B01 - Oxygen sensor before catalytic converter: Excess air detected.
12B304 - Oxygen sensor heating after catalytic converter, activation: Line disconnection.
135608 - Valvetronic system: No movement identified.
135808 - Valvetronic servomotor, position sensors, electrical: Malfunction.
135A08 - Valvetronic servomotor, position sensors, signal: Not plausible.
135C11 - Valvetronic servomotor, position sensors: Signals implausible.

- DME shadow (inactive) codes -
11CF30 - Mixture control: Multiple fault.
12BD80 - Oxygen sensor before catalytic converter: Multiple fault.
21A023 - Combustion engine: Unsuccessful start or engine stopped without driver influence.

Cleared codes, went on a drive and these two Valvetronic codes came back (No CEL though):

- DME active codes -
135608 - Valvetronic sytem: No movement indentified.
135808 - Valvetronic servomotor, position sensors electrical: Malfunction.

Relevant Car details
2014 f30 335i
~ 103,500k miles
MHD stage 2+
Catless
New upper O2 sensor, original lower O2 sensor
upgraded CP and new intake gaskets
5in aftermarket IC
6MT

[4renObject]

Just some updates.

Rattling whenever the car woke from sleep has gone away. I believe it was due to a low battery.

I plan on swapping out the Valvetronic Servomotor.
Potential issue with my lower O2 sensor. I replaced my upper O2 preventatively a few thousand miles ago.

[thejeremyman9]

Originally Posted by 4renObject

Just some updates.

Rattling whenever the car woke from sleep has gone away. I believe it was due to a low battery.

I plan on swapping out the Valvetronic Servomotor.
Potential issue with my lower O2 sensor. I replaced my upper O2 preventatively a few thousand miles ago.

Thanks for updating your own thread for future readers

What makes you think something is wrong with the O2 sensor?