I HAVE A P0420 ODBII ERROR CODE P0420 MEANS ...

1998 Toyota Tacoma

Tiny

uomo1

February, 28, 2013 AT 1:03 AM

I have a P0420 OdbII error Code P0420 means "Catalyst System Efficiency Below Threshold (Bank 1)"
I have done the following.

1.) EGR valve taken out and cleaned
2.) EGR Vacuum solinoid tested
3.) Replace the PCV valve
4.) Replace air cleaner
5.) Cleaned fuel injectors
6.) Replace Gas cap
From all the research I have done I believe the source of the problem is in the EVAP system
Can you point me in the right direction as to where to further troubleshoot.
I know it may even be a bad catalytic convertor but I would like to try and diagnose the problem before I replace it, if it is bad.

Thank you
Arod~





1 Answer

Tiny

homer1967

February, 28, 2013 AT 1:12 AM

Can you see the cat? Is it discolred(purple, blue) if you tap on it with a rubber mallet does it rattle? 99.9% percent of the time a 420 is cut and dry, you need a new cat.

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