Prelude L4-1958cc DOHC (1989)
Catalytic Converter: Testing and Inspection
Fig. 47 Catalytic Converter Assembly
If excessive exhaust system back-pressure is suspected or if tail-pipe emissions are high and all other system check OK, remove the catalytic converter
from the car and make a visual check for plugging, melting or cracking of the ceramic grid inside. If any of the visible areas are damaged, replace the
catalytic converter.