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P0420 is a Catalytic Converter efficiency failer. More than likely you will need a new Catalytic Converter.
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∙ 16y ago
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What mean Po420 Dode caravan?
Do didn't say which engine you have. The trouble code PO420 is telling you there is a catalystic converter not doing it's job. We need to know which engine and what year you have in order to determine which cat is at fault.
2004 Chevy Colorado check engine codes PO420?
P0420=Catalyst System efficiency below threshold
02 prizm with 2 codes po420 and po135 i already changed both 02 sensors and the cat engine light is still on and its getting expensive i need help figuring this out?
the po420 could also be a misfire or vacuum leak
How do you fix po420 on impala 3.4?
Po420 2001chevy lmpala
1999 Cadillac eldorado with code po420?
Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
What code is PO420?
Code PO420 is catalytic converter efficiency low bank 1
What is a PO420 in a 2002 Mercury Cougar?
What is a PO420 in a 2002 mercury cougar: Now if your car is 2.0L DOHC. OBD ll PO420 : Catalyst Efficiency Below Threshold (BANK 1). Hope this helps...
What does code PO420 mean and what you need to do service engine soon light on a 2003 Nissan Xterra?
Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
What is the meaning of code PO420 on a 1998 Toyota Tacoma?
look it up on yahoo as engine codes cylinder 2 misfire it happened on mine the other day. 98 2.7 litre 4x4
Code PO340 and code PO420 99 ford escort zx2 car is firing but wont start?
Trouble code P0340 means:Camshaft position sensor "A"-circuit malfunction (Bank 1) Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
What is code PO420 on a 2000 Chevy Prizm?
catalyst system fault
Code PO340 and code PO420 99 ford escort zx2 1.9 car is firing but wont start replaced camshaft sensor but no luck I dont think its the fuel pump. could you please help thanks?
Trouble code P0340 means:Camshaft position sensor circuit malfunction Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
