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Civic HX, Standard
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Catalytic Converter System (Except Hatchback & Hybrid)
Catalytic Converter System (Except Hatchback & Hybrid)
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DTC Troubleshooting
Notes
DTC P0420: Catalytic System Efficiency Below Threshold
DTC P1420, P2000: NO Adsorptive Catalytic System Efficiency Below Threshold (* & **)