xenon light issues

[rocksteadyX5]

2004 X5 4.4i

Are there common issues that are known with the xenon lights on the X5?

I was getting control light errors on the dash and have since replace the bulbs and the ballast for both lights. The right light would come on every now an then but the left does't come on. No longer getting the error on the dash but still not coming on. Good thing it make the fog lights come on by default when they are not working.

I have not gotten a chance to scan for codes. Are there any common issues that others have come across? The wires all look fine.

Thanks