Charcoal does not go bad
The bottom of the canister is vented to the atmosphere.
It doesn't really go bad, just make sue it's not clogged or contaminated with water. Use an air compressor to check if it's clogged. Plug the air compressor into one of the nozzles.
It usually happens when the sensor responsible for overfilling fails, gas starts to go in the charcoal vapor canister and contaminates it. It causes vacuum system (EVAP) to malfunction. You need to check the sensor or valve what ever you have in your car. You might have to replace the charcoal canister.
driver side, rear fender, go under vehicle its square with two lines.
Its right in the back by the bumper in my 1998. You will see 2 hoses come of the filler hose that go right to it.
Check your fuel vapor canister. this is a charcoal canister that collects your fuel vapors and redirects then through your engine to burn. when the canister fails you will get a strong fuel odor from the vehicle. It is located in the front area of your vehicle.
The hub bearing can go bad and create noise.
It is usually their urine. If you have a rodent whose cage smells bad, try putting charcoal pads where they go to the toilet under a layer of sawdust or shredded paper. The charcoal absorbs the smell. Or, you could train your animal to go in a special plastic toilet (you can get one from most pet stores) that you can wash, and some come with some stuff that absorbs the smell as well. Another option is cat litter. These toilets are usually a couple of quid so give it a go and see what works best for your pet.
that canister is part of the pollution control on vehicles. against the law to disconect it, but if it is disconected you will usually only get busted if vehicle has to go thru a safety inspection
Thermocycling.
There can be a few reasons for a catalytic converter to go bad. One of the causes could be clogs. Other reasons include plugs not working right, and bad exhaust valves.