The XJ6 loses the Sovereign model. Comfy power seats, integrated foglights and new wheels mark the changes for Britain's most popular luxury sedan. On the XJS, the V12 engine is dropped in favor of a 4.0-liter inline-six. Mercifully, a four-speed automatic transmission replaces the previous three-speed. A traction control system starts the car in second gear to limit wheelspin on slippery surfaces.