The car canbus system can check if a bulb is functioning or not on the circuit. Some vehicles measure the entire circuit resistance, others check individual bulbs. however they're checking for the characteristics of a standard filament bulb.
LED bulbs use very little power, the computers on CANbus equipped vehicles could observe this as a "bulb out" and can show a slip code/warning light.
when you swap out the older ancient bulbs for higher LED bulbs vehicles picks up the differenence and essentially thinks one thing is wrong since it wasn't programmed nor designed with the LEDs originally in mind. Newer vehicles have additional sensors in them than older vehicles did and that they acquire and monitor the systems in your vehicle. The less power draw from the bulbs means that the vehicle goes to select up additional resistance, that then shows up to the pc, to that it'll either simply show you the error message and or cut the facility thereto circuit and therefore the bulb you set in will not illuminate.
To avoid flickering, light failure and flashing error messages,LED lights designed with error-canceling resistors is required. These components trick the Canbus system into believing that the LEDs draw as much power as their incandescent counterparts. While many cars don't need error-free lighting products, they're necessary for most European models.