Two problems related to tail light have been reported for the 1999 Volvo S70. The most recently reported issues are listed below.
1999 Volvo S70 - continued rear brake, running light, and turn signal problems. I participated in the original recall campaign (00v405000) to replace the rear turn signal sockets and bulbs. To this day I continue to have problems with the rear turn signals, running lights, and brake lights. I frequently have problems with all of the rear lighting (brake, running, and turn signals). Recently, I found both rear turn signal and both rear brake lights were not functioning. I had to bang on the light housings to get the bulbs to make good contact with the sockets. The only relief I have found is to replace all rear bulbs every 3 months. Even then, I frequently have multiple bulb failures.
I purchased my 1999 used S70 in June of 2001. It had approx. 47,000 miles on it. Within a week or two the electronic throttle control module had to be replaced due to the loss of speed, etc. Within 1 year I had to replace the turbo and the whole engine due to malfunctions. In all, I have spent about $9,000 in repairs to this car due to engine problems. It has been the absolute worst car I have ever owned. It has also had numerous electrical malfunctions since I purchased.