| All bulbs may seem OK but are they matched? The bulb out sensor compares current draw for both sides. If, for instance, one taillight bulb draws more current than the other one, the sensor will light. This could explain why in either the left or right parking position, the bulb sensor does not light because no comparison takes place.
When replacing a bulb, it is always a good idea to replace both left and right with the same wattage from the same manufacturer.
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90 560SEL, 91 300SL
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