Two problems related to tail light have been reported for the 1998 Volvo S70. The most recently reported issues are listed below.
Tail light bulb failure.
1. 12/23/car died in slow freeway traffic; restarted after 5 minutes, but "check engine light" stayed on. Diagnosed as problem with air mass sensor, which was replaced. 2. 11/11/right rear door lock failed; motor replaced. 3. Each of front headlight bulbs burned out with less than 15k in mileage. 4. 1/13/rt and lt outer tail lights burned out; bulbs were replaced. 5. 3/3/right turn signal began flashing too quickly; both rt and lt turn signal sockets were replaced. 6. 4/28/tailights again failed, sockets and bulbs were replaced; 7. 4/29/left turn signal flashing too quickly (even though socket had been previously replaced on 3/3/99 to deal with anticipated corrusion problem). My wife and I have have had more service problems with this car than in 25 years of owning all of our other cars combined.