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Get trouble codes! Some other things to consider would be; whether the cat is actually blocked. I once had a blocked cat on an old carburettor car...
I would definitely check the interface between that metal bracket, the floor of the car, and the bolt that is holding it in place. In case...
I'm no expert - especially as I have only opened the bonnet, once, on an NWH30 Prius. I know they do build up oil and residue, causing blockages...
Soo.. im wondering. -what diagnostic tests should i run? -my computer analysts access is somewhat limited. Non computer analysis equipment...
The first thing to check is the 12v battery voltage when the car is 'dead'. If you are lucky it is just the battery and you can get a new one....