Catalytic Converter for Honda Civic (2006-2011) 1.8L

Direct-Fit Catalytic Converter for 2006-2011 Honda Civic

Direct-fit replacement: Restores exhaust scavenging efficiency and eliminates P0420 catalytic efficiency diagnostic trouble codes on 8th-generation Civics.

The Stock Civic Manifold Converter Deterioration

The factory integrated exhaust manifold-converter assembly on the R18 engine experiences intense thermal cycling due to its close-coupled placement against the cylinder head. Over time, sustained operating temperatures cause internal washcoat thermal degradation and structural breakdown of the ceramic honeycomb substrate. Carbon loading and oil blow-by common to aging variable valve timing engines contaminate precious metal sites, resulting in reduced exhaust throughput, increased backpressure, and persistent check engine lights.

The Engineering Solution

Engineered to original equipment dimensional tolerances, this replacement unit utilizes a high-durability stainless steel exterior shell that resists exterior corrosion and thermal fatigue. Inside, a dense ceramic monolith core coated with active catalytic washcoat materials maximizes surface contact area to efficiently convert hydrocarbons, carbon monoxide, and NOx without choking exhaust flow. Precision-machined, OE-spec flanges and integrated O2 sensor bungs ensure a leak-free seal without custom cutting or pipe modification.

Technical Specifications

Compatibility

• 2006-2011 Honda Civic DX 1.8L L4
• 2006-2011 Honda Civic EX 1.8L L4
• 2006-2011 Honda Civic LX 1.8L L4
• 2009-2011 Honda Civic DX-G 1.8L L4
• 2009-2011 Honda Civic LX-S 1.8L L4
• 2011 Honda Civic EX-L 1.8L L4

The Honda Standard

Engineered specifically for high-revving Honda i-VTEC platforms, this catalytic converter restores factory exhaust velocity and clean engine response without altering the signature intake or exhaust note.