Question about 2002 Pontiac Grand Prix

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Obd2 code p0420 - 2002 Pontiac Grand Prix

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Ok have you 02 sensor replace and your catalytic converter

Posted on Jun 25, 2014

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Could a code po430 and po420 on a kia Sedona 2006 to set a code po441


Google Kia OBD2 fault code lists and look up the codes for yourself, the P0430 and P0420 are worn out Catalytic Converter fault codes. By the way the "0" is a number not the letter, a common mistake by non professionals

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Usually, this code points to a bad catalytic converter but not always... since the rear (downstream) oxygen sensor could be bad (this is the O2 sensor after the catalytic converter).

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98 es 300 read a code of p0420,what could cause this to come up as a false reading?


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Engine light stays on, code is p0420 low thresh bank 1.... where is bank 1 located


I'm not sure you understand the difinition of OBD2 fault code P0420, it means that Catalytic converter in the exhaust that is connected to the engine cylinder bank that contains number one engine cylinder has fallen below the a allowed threshold of cleaning pollunts from the engines exhaust stream. I would be more specific but you have not given model or year of the Mercury you have.
Here is the full difinition of OBD2 fault code P0420 from the factory service information system.


P0420 - Catalyst System Efficiency Below Threshold (Bank 1)


Possible causes - Three way catalyst converter worn out
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module

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Trouble codes PO174,PO401,PO420 NEED TO FIX SO I


P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)

Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com

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Obd2 codes


ur p0172 code refers to ur oxygen sensor, most likly the rear .. and the p0420 code is a catalytic converter deterioration code... the p0172 and 420 can be related because that oxygen sensor is the one installed in ur cat converter.....u most likely will need to replace both the cat converter and oxygen sensor

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Check engine light - P0420 code


Causes A code P0420 may mean that one or more of the following has happened:
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  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Robert

Please rate this solution thanks

Feb 02, 2009 | 2005 Toyota Corolla

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