Checking Cats Without Removing Them?

[LFD2037]

Is there a way to check the cats to see if the interior is clogged or if they've fallen all apart without removing them? Seems like somebody said using a thermal camera but I never got that process to work. I have access to one if that's the way to do it.

 

[chap79]

Smack it with a dead blow hammer and listen for rattles.

 

[nukegoat]

Your land cruiser has a cool way of doing it with o2 sensors and electronics and stuff. P0420

 

[SmokingRocks]

Infared thermometer.

Should be about 270 on the engine side and about 360 on the discharge side.

 

[LFD2037]

Smack it with a dead blow hammer and listen for rattles.

I forgot to add:
I have a rattle upon acceleration from a stop. I've checked all the heat shields, checked for any loose metal parts and banged on the cats but can't reproduce the rattle.

 

[LFD2037]

Your land cruiser has a cool way of doing it with o2 sensors and electronics and stuff. P0420

I've seen a few people who didn't have the ambiguous p0420 code yet when they removed their cats the guts were completely wasted and fell out in chunks.

 

[LFD2037]

Infared thermometer.

Should be about 270 on the engine side and about 360 on the discharge side.

Is this when cold or at normal operating temperature (~194*) while idling? Thanks!

 

[SmokingRocks]

after 20 mins of highway driving, the discharge should be hotter than the input.