$59 secondary air pump aftermarket with free returns ebay.us/yiPA9p
$74.95 secondary air system combination valve. ebay.us/ijfjIX
these two are the most common cause of this code that is seen in the work manuals and forums.
if it's not these two parts that are causing your problem is either going to be the pressure pipe or pressure sensor or a wiring problem the O2 sensor or very rarely your map sensor.
Before you PURCHASE EITHER OF THESE I recommend running through the test procedure that I have in the video to see if these two work if they don't the ones I have listed above or the best cheapest I could find.
I've been struggling with this code for quite a while now I finally figured out the problem one of the problems a bad secondary air pump and blown fuse.
I just wanted to share my results, and some of the techniques I used to figure it out so hopefully it will help somebody out there diagnosis this problem faster.
although I still have a check engine light after this I did fix some of my problems.
I will update if I ever get this thing figured out #$_#@_+_$$!!
Негізгі бет Fix Code P0491 secondary air injection pump insufficient flow. 2009 VW Jetta 2.5L.
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