O2 Oxygen Sensor Upstream Downstream for Honda Accord (2000-2002) 3.0L

Direct-Fit O2 Oxygen Sensor Kit for 2000-2002 Honda Accord (CG1/CG2)

What it Does: This upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust gases on the 2000-2002 Honda Accord (CG1/CG2) J30A1 3.0L to regulate air-fuel ratios and verify catalytic efficiency.

The Stock Honda Accord O2 Sensor Failure

Over high mileage, factory zirconia elements on the CG1/CG2 chassis with the J30A1 3.0L V6 suffer thermal fatigue, silicone poisoning, and carbon fouling. Their internal ceramic heaters frequently fracture or develop open circuits, throwing P0135 or P0141 codes and delaying closed-loop fueling. When upstream sensor response slows, the ECU defaults to rich open-loop trim, fouling spark plugs and overheating the catalytic substrate.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light / DTCs: Triggers P0135, P0141, P0133, or P0171 from heater burnout or sluggish voltage switching.
• Poor Fuel Economy: Skewed voltage feedback forces rich fueling, dropping MPG and fouling plugs.
• Failed Emissions & Rough Idle: Erratic air-fuel trim causes surging and fails OBD-II readiness monitors.

The Direct-Fit Zirconia O2 Sensor Solution

Replacing both positions together restores crisp millivolt switching across the J30A1 exhaust stream. Each direct-fit sensor uses a corrosion-resistant stainless housing, laser-welded shield, and fast-acting ceramic heater matched to OEM specs (234-4099, 234-4367, 234-4355). Factory-style weatherpack connectors and OEM harness lengths eliminate wire splicing, delivering true plug-and-play installation, accurate closed-loop fuel trim calibration, and reliable downstream catalyst monitoring under all driving loads.

What's Included

• 1x Upstream Oxygen Sensor
• 1x Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2000-2002 Honda Accord 3.0L (Upstream & Downstream Positions)

Frequently Asked Questions & Fitment Warnings

Does this fit the CG1/CG2 Accord?

Yes. Fits the 2000-2002 Honda Accord with the J30A1 3.0L engine. Excludes 2.3L 4-cylinder models and the 1999-2000 Civic 1.6L.

Will this clear P0135, P0141, or P0133 codes?

Yes, if caused by a failed sensor. Replacing both units with 234-4099 / 234-4367 / 234-4355 equivalents restores heater resistance and signal speed; clear codes afterward.

Is wire splicing required for installation?

No. Both sensors include OEM-style connectors for direct plug-in installation; torque evenly into clean exhaust bungs.

The Honda Precision Standard

Built for factory emissions compliance and accurate ECU feedback, this matched sensor kit keeps your J30A1 CEL-free. Reliable air-fuel control restores throttle response and daily fuel efficiency.