You should avoid repairing a car puncture at home if the damage is on the tire’s sidewall, the puncture is larger than 6mm, or if the tire is severely worn out. Sidewall damage compromises the tire’s structure, making it unsafe even after a patch. Similarly, large holes or multiple punctures require a professional solution or replacement. Attempting to fix such issues at home may put you at risk of accidents. In these cases, the best option is to call a mobile service like Crossroads Helpline, which can provide expert assistance and ensure your safety without delay.