03 cayenne brake Proportining warning light Abs Light Help please

[Edgar_vapes]

I have a brake Proportining warning light on my 2003 cayenne everything works fine truck drives, the only thing that doesn't work is the speedo (mph) side,& won't mark miles as I drive it stays at 104k, rpm side works fine, from time to time the radio starts to turn the volume up or down alone, like if it has a mind of its own. One more thing the nav won't work it stays at my house street even tho I'm in another city, I checked under my driver side carpet everything looks good! Dry! I even check the 4 sonic welded wires that get corroded, they seem clean with No corrosion, checked all fuse boxes and every fuse one by one they all seem fine,any help would be greatly appreciated I'm trying to fix this problem ASAP thank guys!

[wvicary]

You need to check for fault codes.