For those "ridges" on the outer part of the rotor. I just have my brother spin the wheel by hand while I hit it with a grinder. Grinding on it while it's spinning simulates being in a lathe and actually comes out nice and clean. It's a little tricky to get the backside of the rotor-- but it can be done. We've done this on our own cars and trucks for years and it has always worked well. Only if the rotor still has a lot of meat on it though. If it's getting too thin-- then obviously you have to get new rotors.
I have a 2012 Buick Verano and engine light came on. Found out it was p0014 & p0015 intake & exhaust changed both of them. Damn light come back on. Scanned it again showing same code. Got news ones again and same time changed oil & filter. Light went out. Next day damn light back on and saying reduce power. Code reads poo16 & 17. Damn electricity shi*. Have you experienced any Buick like that. It runs great and also, forget mention changed 4 spark plugs as well.
