Lexus GS 350 Owner's Manual page 811

When a problem has occurred
If you have a flat tire
Stop the vehicle in a safe place and replace the flat tire with the
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spare tire. (→P. 722)
The vehicle becomes stuck
Try the procedure for when the vehicle becomes stuck in mud,
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dirt, or snow. (→P. 749)
What to do if... (Troubleshooting)
809