P0491 Error Code

J

Johnkern

New member
Alright!

New to the forum here, bought my 2006 Z4 2.0i in late october 2017.
Been using it alot lately since summer finally hit us here in Norway and my first problem showed up in the shape of a Check Engine light.

Took out my Bluedriver scanner and got P 0491 (Air System Insufficient Flow Bank 1).
Drove around with the scanner plugged in and noticed some values did not change at all:
0.000V O2 Bank 1 - Sensor 2 - Oxygen Sensor voltage
The voltage stays the same while driving, but for O2 Bank 2 the voltage is between 0.300V and 0.440V.

Also noticed the values on the MAF while driving:
0.00g/s Mass Airflow Rate from when i started the car to when i stopped it.

If anyone got any tips or tricks for this problem I would be grateful!

Thanks
-J
 
Check to rubber boot the comes from the maf into the engine there known to split when they get old.
Letting air in that isnt accounted for
 
I looked over the boot and it looks fine, tried disconnecting the MAF with the car running and no difference at all.
It runs «sluggish» and the rpms jump sometimes while idling both with the MAF connected and disconnected.
No new codes or anything.
 
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