Oxygen Sensors for Honda Civic (2001-2005) 1.7L Upstream & Downstream

Direct-Fit Oxygen Sensor Kit for 2001-2005 Honda Civic

What it Does: The Oxygen Sensor Kit replaces aged factory upstream and downstream sensors on the 2001-2005 Civic to restore accurate closed-loop fuel metering, stabilize air-fuel ratios, and eliminate catalyst efficiency diagnostic trouble codes.

The Stock Honda Civic Sensor Degradation Problem

Over extended heat cycles and mileage, the factory zirconia sensing elements in the seventh-generation Civic become coated with combustion blow-by, carbon deposits, and oil ash. On the D17 platform, degraded sensors experience sluggish switching response times (cross-counts) between rich and lean states. This slow voltage feedback keeps the engine control module (ECM) from maintaining the target 14.7:1 stoichiometric ratio, triggering false P0420 catalyst efficiency codes, rich-bias fuel trims, rough idle, reduced fuel economy, and failed tailpipe emissions tests.

The Engineering Solution

Engineered to resolve unmetered fuel trim drift, this dual-sensor package features premium planar ceramic sensing cores housed in laser-welded, corrosion-resistant stainless steel shells. Precision micro-porous platinum filter layers prevent exhaust particulate contamination while ensuring rapid thermal ramp-up for fast closed-loop engagement. Equipped with pre-loomed heat-shielded wiring harnesses, OE-matched locking connectors, and factory hex-threaded housings, this matched set installs without wire cutting, splicing, or resistance variance.

Technical Specifications

Compatibility

• 2001-2005 Honda Civic DX / LX 1.7L SOHC (D17A1)
• 2001-2005 Honda Civic EX 1.7L SOHC VTEC (D17A2)
• 2001-2005 Honda Civic HX 1.7L VTEC-E (D17A6)
• Fits 2-door Coupe (EM2) and 4-door Sedan (ES1) chassis

Frequently Asked Questions

Does this fit the EM2 and ES1 Civic?
Yes, this kit provides direct-fit upstream and downstream sensors for 2001-2005 Honda Civic chassis running the 1.7L D17 engine.

Will replacing both sensors clear existing O2 and fuel trim CEL codes?
Yes, clearing stored DTCs after installation allows the ECM to reset short- and long-term fuel trim adaptations to baseline.

The Honda Standard

Keep your JDM commuter running with factory efficiency and crisp throttle response. Accurate air-fuel feedback protects your catalytic converter from raw fuel wash and maintains optimal combustion across the entire rev range.