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People with a suspect cat are reluctant to spend the money on an expensive replacement if they are unsure of both the diagnosis and result.But with a looming Smog Test there is only one cheap diagnostic test I can think of .It is not a permanent fix and it is illegal to drive with the test parts in place. It is just to use long enough to monitor the voltage of all 4 O2 sensors.
Use SHORT anti-foulers or extenders on the rear O 2 sensor of the failing(?) cat . On Bank 2 there is space.Bank 1 requires more creativity.
You can also try cleaning the cat. Neither of these are smart fixes imho but they may ' get you by' - but just to test. Be aware the extender may cause a lean code !
The extender will cause the rear O2 sensor voltage to 'flat-line' and look like the cat is working. This is your clue to replace the cat - assuming all the other suspects have been eliminated/replaced with correct ,new parts - coils,O2 sensors,plugs,vac leaks all other related codes.
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