I recently bought a used CLA 250 and the right passenger headlight is not functioning properly. I noticed that it had condensation in the housing and while I was driving it I received 3 different error codes saying "check right fog light, day time running light" and one other I can't recall at this moment. This was at a used car log not at MB but the dealer agreed to fix the headlight when I purchased the vehicle. Well he didn't realize how expensive the bi-xenon's are and when I returned to get it repaired I saw that he had purchased two halogen lights instead since that set was cheaper than just my right light. I told him that those were not the correct lights and we ended up getting into a major argument about it unfortunately in Florida their is no cool down period or anything I can legally do at this point to force him to do the right thing. In his eyes he is giving me to functioning head lights which "fixes" the problem. But from what I am reading on here it's not going to be a pug and play solution. All the threads I have found though are going the opposite direction because of course who in their right mind would remove 2,000 dollar headlights to put in halogens. As a last resort I may just tell him to forget about it and I will just eat the loss and replace it my self if I need to. If it was a plug and play swap I was going to let him do it and just ask to keep the working light and then sell the two halogens and pay for the replacement myself but if they are going to have to cut or modify the wire harness that may not work out.