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The codes you mentioned are OBD-II trouble codes that indicate specific issues in a vehicle's engine and emissions system.
- P0171 and P0174 indicate a lean condition, meaning the engine is receiving too much air or not enough fuel.
- P0401 signals an issue with the exhaust gas recirculation (EGR) system, specifically insufficient flow.
- P0420 points to a problem with the catalytic converter's efficiency.
Each code suggests a different area of concern that may need diagnostic testing and repair.
What else can I help you with?
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
What code is PO420?
Code PO420 is catalytic converter efficiency low bank 1
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.
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...
2001 grand prix diagnostic trouble codes po420?
P0420 is a Catalytic Converter efficiency failer. More than likely you will need a new Catalytic Converter.
What does code PO420 mean for chevy S10 4 cylinder?
Catalyst efficiency below threshold. (The catalytic converter may be failing.)
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
What is code PO420 on a 2000 Chevy Prizm?
catalyst system fault
Whats does it mean when your obd ii scanner reads po420 and how do you fix the problem on a 2000 Mitsubishi Galant?
You need to obtain a troubleshooting chart for that code. If I recall, it has to do with the Evaporative system.
What different codes are there?
Depends what you mean by codes. Do you mean Cryptology or "Passwords".
