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What does the code P0420 means in a 2003 buick lasaber

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The P0420 means Catalyst System Efficiency Below Threshold.
__________
carprog full V4.01

Posted on Nov 03, 2012

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Check the meaning of codes, for p0420 and p0496


P0420 Catalyst efficiency below threshold Bank 1.
P0496 Evap emission high purge flow fault

Mar 22, 2016 | 2010 Buick LaCrosse CXS

1 Answer

What does a diagnostic tool mean when saying "bank 1"...


It usually means the catalytic converter is not getting hot enough to function, but could be another issue. The sensor readings between the sensor before and the sensor after the cat are not within spec.
Bank one is the side with cylinder one, or the side with the catalytic converter.

Jul 25, 2014 | 2003 Buick Regal LS

1 Answer

Where are the O2 sensors? I found one directly behing the spark plugs on the back.


The O2 sensor (2 on V engines) are in the exhaust system pipes before the catalytic converter, the next sensor is the efficiency monitor for the catalytic converter system it looks like a O2 sensor but performs a much different function as far as testing goes. The codes you have follow.

P0420 - Catalyst System Efficiency Below Threshold Bank 1
What does this mean? In most cases it means the catalytic converter is worn out and that is sensed by the catalyst monitor I spoke of earlier.

P0102 - Mass or Volume Air Flow Circuit Low Input
Faulty mass air flow sensor
- Dirty mass air flow sensor (located in the air intake hose to the engine from the air cleaner)
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks

Nov 02, 2012 | 2003 Buick LeSabre

1 Answer

My check engine light is on, and the code is P0420, it's a Pontiac Grand Am. What does the code mean?


Go to Advance Auto. They have free troubleshooting of engine codes. The techs there can give you a list of causes for the code based on your automobile.

Dec 23, 2011 | 2003 Pontiac Grand Am

1 Answer

2000 BUICK LASABER CUSTOM REMOVE AN REPLACE


  • Hello, and thank you for the opportunity to assist you. Here is the serpentine diagram for a 2000 LaSaber. The only engine size for that year was a 3.8 which I have always thought of as an all around great engine.



10_16_2011_6_32_00_pm.gif

  • If you have any questions or comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards,Tony

Oct 16, 2011 | Buick Cars & Trucks

1 Answer

I have two codes that just came up: P0420 and P0845 Can you tell me what these mean?


code P0420 catalyst system efficiency below threshold. ( catalytic convector )

any 0800 codes are automatic trans-axle system malfunction.

code P0845 problem in 3rd clutch transmission fluid pressure switch circuit.

Feb 05, 2011 | 2003 Honda CR-V

1 Answer

Had p0420 code on buick v-6. replaced cat. convrter, both o2 sensors and had tune up. light still comes on.


A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • 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.

Jul 24, 2009 | Buick Park Avenue Cars & Trucks

1 Answer

Cruse control


Does your blower fan work on your heater/ac or your rear defrost work it could be the igniton switch were you put the key in. Turn the car on and off several times once you notice the cruise will not work and see if it starts to work if it does than it is the ignition switch this just happen to my 2003 century.

Sep 14, 2008 | 2003 Buick LeSabre

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