[monitoth]

Hi, so I have a 2008 smart fortwo passion convertible. It has a body kit with extra LED lights and both of the rear brake lights are red and working.

The issue is that when I press the brakes the front right side indicator yellow light, lights up. It's not blinking it's a continuous.

 

[Miss Mercedes]

Your problem will most likely trace to the LEDs. If your LEDs don't have resistors or CANBUS boards in them then the car's systems get all messed up as they're designed for incandescent/halogen bulbs. I had this same problem until I got CANBUS chipped LEDs.