Sensor Or Cat?
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Junior Member
Joined: Dec 2006
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From: san ramon, ca, USA
Sensor Or Cat?
Ok so i got the code P0420 - Catalyst System Efficiency Below Threshold (Bank 1) after i had replaced my timing belt and water pump. My car is a 99 civic si w/ 111k miles. I suppose i need a new cat or replace the first o2 sensor. Is it worth doing both at teh same time or buying one at a time? Any suggestions?
Honda-Tech Member
Joined: Feb 2008
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Re: Sensor Or Cat?
Ok so i got the code P0420 - Catalyst System Efficiency Below Threshold (Bank 1) after i had replaced my timing belt and water pump. My car is a 99 civic si w/ 111k miles. I suppose i need a new cat or replace the first o2 sensor. Is it worth doing both at teh same time or buying one at a time? Any suggestions?
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Si_chRis
Honda Civic / Del Sol (1992 - 2000)
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Dec 25, 2008 08:52 AM