Can anyone help me out regarding the lamp defect warning light on my 97 E320. I have replaced the original head light and parking light with super white halogen head light and blue parking light of the same wattage. Once in a while the lamp defect warning light will light up despite everything working fine. The only mal functioning I find is that the left and right parking light will not go on individually when I turn the light switch to left and extreme left. But they would both go on simultaneously when I turn on the parking lights together or when I shut the doors. I also checked the rear brake lights and everything works fine.

Any suggestion is greatly appreciated.
Many thanks in advance.

Ken
97 E320