if the lamda sensor is missing you're gonna need one.. they're pretty cheap (need one myself for a 106) if the sensor is there, and its just a hole, you could just get it repaired (small patch welded on)
as long as the lamda is in place you wont do any damage to the car, it'll just sound really LOUD!!!! A dodgy quick temporary repair if the hole isn't too big is to fold over loads of tinfoil, wrap it around the pipe, over the hole, and secure with some hose clips
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