I just put new wheels on and now I'm getting a tire pressure monitor fault when I start up..the indicator light will flash off and on randomly as well. Anyone else have this happen with 20" wheels?
When you got your new rims, what happened to those little blue things tied strapped to the inside of your original rims? You have to get new ratcheting bands and install them to your new rims. The reason you are getting a fault message is because the TPMs weren't reinstalled with your rims.
They came off an 06 GT and he never had any problems,
It will probably be easier for you to just deal with the flashing light. You will have to have a shop dismount all 8 of your tires. There are two ways you can switch the sensors to your 20's. First, if the shop has bands to wrap around the wheels and clips to hook the sensors to the bands then they can put them on the 20's and simply unclip the sensors from the factory wheels and clip them onto the inside of the 20's. If they have the bands, but don't have the clips, they will have to cut the bands off of the factory wheels and use the factory clips that the sensors are already attached to. If they don't have the bands, then you shouldn't be there in the first place. We've done many of them and have never had any problems you just need to make sure they get the bands tight on the 20's. If you try to buy the bands from Ford they will cost you about $50 each plus a ton of labor, but many shops have the banding material to make bands for you wheels and it shouldn't cost much. Most of the cost will be in dismounting, remounting, and balancing all 8 of your tires. Nothing will happen if you just leave them as they are except you having to just deal with it.
Nothing like trying to idiot-proof something, and ruining it for all the people with half a brain.