it is safe to drive in safe mode forever until you cook the clutches and the transmission no longer moves in reverse or forward ! however this will only happen if the fluid pressure pump gets destroyed. if you have good line pressure and its not an issue you can drive you car it will just be dog slow to accelerate ! 4way flashes needed

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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.