Make sure both bulbs are the same manufacture (front to rear in this case) and that the connections at the bulb base aren't dirty. Anything that produces a different current draw between the two bulbs will cause the lamp out to light.
I went through three sets of tail lights on my sister's Volvo before we got a pair that wouldn't turn the blasted lamp out warning on!
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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