If problems are encountered with the function of the stop lights or/and tail lights in the above vehicles, particular attention should be paid to the bulbs and their holders. It may occur that the bulb failure check indicator light does not go off even after the defective light source has been replaced. In such a case, check the contacts of the bulb holder for corrosion, adequate pre-tension and contacting.
If this does not fix the problem, all the 6 bulbs of the tail and stop lights should be replaced:
2x bulbs of the stop lights 12V/21W
2x bulbs of the fog and tail lights 12V 21/4W
2x bulbs of the tail lamps 12V/5W
Make sure that the bulbs are from the same manufacturer or have the same resistance value. The bulb failure check is very sensitive to voltage drop and different resistance values of the light sources.
Important safety note