GeekinTexas posted an answer for this Hyundai Cars & Trucks:
"Most people think you have to program the key fob to match the car. In fact, the opposite..."
GeekinTexas posted an answer for this Kidde Nighthawk Combo Gas/co Detector:
"Kidde Nighthawk KN-COP-DP I also got the ERR code this morning, with a beep every 30..."