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00 sentra check engine light po420 po430 how to test the cat? Forums > > 00 sentra check engine light po420 po430 how to test the cat? 00 sentra check engine light po420 po430 how to test the cat?
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  #1  
Old 08-31-2012, 01:06 PM
jlcbriscoe jlcbriscoe is offline
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2000 Sentra
 
Join Date: Aug 2012
Posts: 7
Default 00 sentra check engine light po420 po430 how to test the cat?

hello my 00 sentra keeps bringing up these codes they were cleared and went away then a new code came up those were cleared and now the original codes are back . Does anyone know how to test a cat ? i saw a few people with problems with the computer needing to be reprogramed does anyone know if this is a common problem? The car seems to be running fine but wont pass smog becuase of the service engine light
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  #2  
Old 08-31-2012, 01:11 PM
JudoJohn JudoJohn is offline
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2002 Sentra
2003 Sentra
2002 Sentra GXE
 
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Location: St. Louis
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P0430
Catalyst System Efficiency Below Threshold (Bank 2)
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  #3  
Old 08-31-2012, 01:11 PM
JudoJohn JudoJohn is offline
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2002 Sentra
2003 Sentra
2002 Sentra GXE
 
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Location: St. Louis
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P0420
Catalyst System Efficiency Below Threshold (Bank 1)
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  #4  
Old 08-31-2012, 01:13 PM
JudoJohn JudoJohn is offline
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2003 Sentra
2002 Sentra GXE
 
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google the codes-- there are sites that explain what it could be, etc. most likely the o2 sensors or the cat. O2 sensors are cheaper.
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Old 08-31-2012, 01:13 PM
jlcbriscoe jlcbriscoe is offline
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2000 Sentra
 
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I should also mention i replaced both 02 sensors and then cleared the codes when they stayed off but their back again

Last edited by jlcbriscoe; 08-31-2012 at 01:24 PM.
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  #6  
Old 08-31-2012, 06:17 PM
ritter ritter is offline
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2004 sentra
 
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You should have 4 sensors not just 2!
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