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secondary air valve

  1. General E46 Forum
    This is my first post to this forum and I apologize if it is misplaced. I have looked everywhere on the forums and cannot find what is causing my Check Engine Light. about 4 months ago I got a P1421 code from the car's computer. It was still cold here in the north and I figured I would wait...
  2. ///M3 Forum
    This may be useful for those running headers, tunes, SC kits, or a combination of mods. BMW Part Number: 11121438086 Installation should be pretty self explanatory. Here's what it looks like installed. I've noticed an increase in bottom end torque and better gas mileage. Same net...