[Pablito1702]

One of my rear tail light bulbs failed (2009 135i Sport with xenons). All the other bulbs (turn signal, back-up, brake) function. My tail light seals were replaced under the SIB 630310 two years ago. I read a number of posts regading tail light failures and they all seem to be about replacing the entire unit or upgrading to newer LCI style units.

I assume I can just replace the bulb (#4), but not sure if there are any other parts that might have failed (socket #7?) due to the corrosion issue that caused the SIB for the seal replacement.

Can anybody school me on what to order? I have attached the parts diagram. Also when the parts suppliers specify right or left, what is driver side versus passenger side?

Lastly, besides aethetics, what are there other reasons to do a full LCI replacement? The cost ($290) seems reasonable if there are long term benefits.

Thanks!