- DENTED OR CRACKED SHELL Cause: Road Hazards or Installation Damage Examine: Low hanging Exhaust, Broken Hangers
- CLOGGED SUBSTRATE OR CARBON DEPOSITS Cause: Fuel Mixture Too Rich or Oil or Antifreeze Entering Exhaust or Leaded Fuel Examine: Piston Rings - Warped or Cracked Cylinder Head - Valve Seals
- CRACKED NECK Cause: Over Expansion During Installation Examine: Broken Hangers, Manifold Spring Bolts, Motor Mounts
- BROKEN OR MELTED SUBSTRATE Cause: Fuel Mixture Too Rich or Raw Fuel and/or Oil Entering Exhaust System Examine: Ignition System - Plugs and Wires, Check or Diverter Valves, Oxygen or Coolant Sensor
- SHELL DEEPLY DISCOLOURED Cause: Fuel Mixture Too Rich Examine: Excessive Oil in Exhaust - Air Pump, Check and Diverter Valves
*NOTE: Excessive idling or hauling heavy loads will also contribute to converter failure. Most significant is failure to keep engine properly tuned.
Common warning signs to catalytic converter breakdown
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