Many of the modern 21st century European vehicles have an electrical can-bus system that detects when and where a bulb is not properly functioning. Since LED bulbs naturally have less power draw on the system, many European vehicles see this as a fault and as a result, an error message appears. One way to solve this issue would be to add a resistor to the circuit to mimic the power draw of the factory incandescent bulb, but that requires modification of the factory wires which is not something everyone is comfortable with doing. Error free LED replacement bulbs have built-in resistors inside the LED bulb that prevent unnecessary modifications to be done. Our plug and play replacement LED bulbs are perfect for most European vehicles that need a can-bus friendly LED alternative.