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Discussion Starter · #1 ·
The vehicle is a 2001 Civic LX.
I replaced the converter and O2 sensors because the factory converter had a broken weld on the #4 primary.
The car never had a PO420 code until I replaced the converter and O2 sensors.
The code shows up every other day and I reset it with my code reader.
What is wrong with my car and how do I repair it?
 
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