I installed them in my 2018 Mazda3 Touring and installed high and low beam bulbs. Installation is easy, just remove and insert the factory bulbs. Zipper closure to keep it from dangling. After doing all that, I reached out and turned on the light. Viola! bright lights! I cleaned my flashlight and zipped it up, closed the hood and backed out of the driveway and that's when the problems started. The My Check engine light came on immediately and the Service Your Car NOW lights in the infotainment center flashed. Charging system, traction control, collision warning, etc. I didn't get the bottom 3 errors because I parked the car. Opened the hood, reset the factory bulbs, restarted the car and everything was back to normal. I tried to contact the seller's support site and got the message: Coming soon. Soon. I would not buy a 2018 Mazda3. and if you buy, make sure you can install it with a return window so you're not stuck with useless $80 lightbulbs.
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