Fix The Real Problem First.
Then Change The Converter.
Then Change The Converter.
PO420 & PO430 Codes What Do I Do Now?
The last thing you do when you get one of these “Below Efficiency” Codes is change the Catalytic Converter!!!
Keys to a Successful Repair
Check for TSB’s.
Correct all other engine trouble codes.
Check or replace all 02’s.
De-Carbonize all engines over 80,000 miles.
Inspect for head and intake gasket leaks.
Check EGR system and clean ports of excess car- bon build up.
Inspect and test fuel pressure. Leaking injectors?
Check for heavy oil usage.
Monitor fuel trim for signs of excessive correction by the PCM.
DO NOT USE silicone sealers.
Reset all monitors and Drive Cycle test.
PCM Re-flash if needed.
Fill out the warranty card.
RICH Condition
Broken Substrate
Melted Substrate
Unable to do it’s job
Bad or Lazy Upstream O2
Leaking Injectors
Bad Temp Sensors
Mass Air Flow Bad
Miss Fires Bad Plugs
Clogged Air Filter
LEAN Condition
Too Much O2
Too Much NOx
Cold Converter
Excess Carbon in Engine
Bad Exhaust Manifold
Air Leaks Bad Gaskets
Fuel Starvation
Bad or Lazy Upstream O2
Bad or Clogged EGR
Did you misplace or not receive a warranty card?
Download your missing card here
Download your missing card here
