Installation DIY guide for High Power Error Free LED License Plate Lights for Mercedes W204 C Class, W212 E Class, W221 S Class, etc (75-003).
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Step 1: Take off the trunk lid inside panel.
Step 2: Take off the carpet behind the trunk lid.
Step 3: Take off the trunk license plate lamp trim.
Step 4: Replace the stock license plate light lamp with the OBC Error Free LED license plate light lamp module.
Step 5: Test it to make sure it works and put back the trim, carpet and inside panel.