Anyway to diagnostically test a catalytic converter?

[kendem]

Pulled mine off today and it looked good. No melting or cracks and no visible cloging. So how does one know if it is really good?

Ken

[r3v_v3ng3]

i think you have to take it to a shop with a 5 gas analyzer. don't really know how they do it but i think they make a rich mixture and they they see how much did the converter reduce the emissions.

[kendem]

Maybe I'll just change the darn thing, after all it's almost 20 years old.

[greencar]

No real way to check the cat and make sure it is working properly. The only real test is checking the temperature difference between inlet/ outlet.

OBD II vehicles utilize multiple o2 sensors that check for catalytic efficiency.