The Four Wheel Warning Light is on when I start the vehicle. It occasionally goes out when I restart the vehicle once or twice. No LED light indication on the center console with four wheel engage to LOW or High. I never use the four wheel drive at all. Anyone had this problem?

Update from Feb 5, 2012: To change battery from Porsche Cayenne:

Tools Require: Rachet, rechet extention, M10 12 point screw/bolt remover, 10mm socket, phillip and flat screw driver, needle nose and cleaning materials. Battery brand: Interstate H7 group, Cost $150

On the driverside seat, remove 2 plastic cover on the front of the seat floor. Unbolt 2 screw/bolts with the 12 point bolt removal. On the back of the driverseat rails, removed plastic cover over the rails (2 pieces). Middle plastic strip pops upward and the main body slides rearward (may require some muscle to slide it back). Tilt the seat assembly back, clear seat from the steering wheel. If you cannot move the driver seat, charge the battery first from the engine compartment. When the battery compartment is exposed, unhook seat cable, remove the water vent hose (front of battery) and set aside, unscrew air vent and set aside, remove the battery cover by unlatching 4 latches on each side, unbolt battery terminals (negative and positive), unbolt 2 battery clamps utilizing 10mm socket,. Remove old battery, prep and clean area. Install new battery, 2 battery clamps, connect positive terminal, Note: To avoid discharging the new battery, prep the area, remove unnecessary items/tools accept tools that are needed. When ready, quickly install negative terminal, cover and latched, air vent with screw, water vent hose and seat cable hooked. Tilt driver seat forward and install 2 bolts with the 12 point screw and install plastic rail cover in the rear of the seat. You will hear the vehicle with noise such as small motors, electronic and light as you install and complete the work. When you start your Cayenne, expect some light to come on such as PSM on the odometer, drive it for about 4 miles to reset. Congratulation!!! You just save $400+. Have a beer