All car electronics would flicker and the car would come close to shutting off. Idle would severely dip, dash lights would flash, and radio would restart.
Checked battery, and alternator. All was fine. Did a little searching on Vortex and found that the MKII's and MKIII's have this same issue. With a few MKIV's.
Went to the dealership and bought a new one. Part # 4B0905849 for a list amount of $84.87 and out the door for $91.62. Argued with the guy at the counter that it's not my alternator but my ignition switch. I told him that when I move my key in the ignition it will also cause the issue. After hearing that he gave in and agreed.
Ok, I left out some pictures of removing the lower dash because if you are not comfortable removing the lower dash without assistance, then I would recommend leaving this to the dealer. As the replacement is pretty easy and shouldn't take more than 45 mins.
I used just two Torx bits (not sure on the sizes) and a SKINNY flat/philips head screwdriver that I picked up at Pepboys in the dollar bin a while ago. You will need a small long philips head screwdriver to access four screws.
**Disconnect the negative terminal from the battery first as a safety precaution***
Start by removing the panel that covers the fuses:
Then remove the left panel; it pops right off. When you pull it off you can see the screws that you will need to remove the metal panel underneth both plastic pieces.
Remove the right panel now. There is a small screw at the bottom/middle holding this panel to the metal piece. Remove that screw and the rest pops off:
Now turn the steering wheel as far right as you can. Exposing a small port for a deepset screw. Be careful removing this screw! It can be stripped easy, as I did just that. This is where that long small philips head screwdriver comes in handy!
Then move the steering wheel all the way to the left, doing the same:
Now look underneth, there are two more deepset screws that you will have to remove:
After you have done this it will be a good idea now to remove the lever so you can pull off the bottom plate fully. There are only two torx screws:
Now you can pull off the bottom plastic piece:
On the left you can see the harness and the ignition switch:
Gently pull off the harness on the ignition swich. Its a bit annoying to pull it off all the way as the wire bundle is in the way, but it will give:
Here you can see fully the ignition switch with the harness removed:
**Before pulling switch out make sure your ignition is off, and the key is removed from it***
Now, this part is what made my replacement of the switch take forever!! I could not for the life of me pull out the switch. I was looking all around for some hidden screws holding the piece in, and playing with different key positions thinking it was locked in. Nada.
If you look closely you can see VW painted these screws red!!! Remove these and the switch will easily pull out. You will need a tiny flathead screwdriver for this:
I took a look at the old switch and it looked perfectly normal. I pulled it apart further and again it looked fine! But concidering VW's electronics, this doesn't surprise me.
Now for installation Just pop in the new switch and reconnect the harness and screws!
Double check the harness, switch, etc. Make sure everything looks good. Just install the metal panel, then the three plastic pieces in reverse order and you are all set!! Reconnect the battery and don't forget to recalibrate the throttle body! You're all set!!