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P0420 - Catalyst System Efficiency Below Threshold (Bank 1) help

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  #1  
Old 03-17-2009, 01:55 PM
DannyLB's Avatar
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Default P0420 - Catalyst System Efficiency Below Threshold (Bank 1) help
This is the reason why my 1997 Honda Civic LX just failed the emissions test.
Could it be a guarantee that i have to change the catalytic converter?

What are the problems related to this? Pls help.
 
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  #2  
Old 03-17-2009, 02:30 PM
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Its either that the cat is bad or the o2 sensor is bad I've got the same problem with mine I'm replacing both
 
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  #3  
Old 03-17-2009, 03:06 PM
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I think im gonna end up changing the cat converter. I know this guy that is willing to change it plus the timing belt and the water pump with labor for $850. Very pleased with that price.
 
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Old 03-17-2009, 03:59 PM
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i got that code after removing my cat far a header.
 
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