Sangyue Oxygen Sensor Kit for Honda Accord 1998-2002 2.3L (F23A1/F23A5) — Upstream & Downstream Pair, Direct Fit

Sangyue 2X Oxygen Sensor kit provides both upstream and downstream O2 sensors engineered to replace the original units on 1998–2002 Honda Accord 2.3L (F23A1 & F23A5) engines.

If your Accord is showing a check engine light, rough idle, or reduced fuel efficiency and it uses the F23A1 or F23A5 2.3L engine, replacing both the upstream (sensor 1) and downstream (sensor 2) oxygen sensors is a common and effective maintenance step. This Sangyue pair is sold as a two-piece set and designed to fit Accord model years 1998 through 2002. The kit includes a one-year unlimited mileage quality guarantee and is intended as a direct-fit replacement when the vehicle match (make, model, year, engine code) corresponds.

Will these sensors fit my 1999 Honda Accord 2.3L F23A5?

Yes, the Sangyue kit is specifically listed for Accord 1998–2002 with the 2.3L F23A1 and F23A5 engines. Always verify your vehicle details before purchasing to ensure correct connector type and oxygen sensor location.

• Fits Honda Accord model years: 1998, 1999, 2000, 2001, 2002
• Compatible engine codes: F23A1 and F23A5
• Sold as a pair: upstream (sensor 1) + downstream (sensor 2)
• Confirm fit using the seller’s vehicle selector (make, model, year, engine)

How do upstream and downstream sensors differ, and why replace both?

Upstream (sensor 1) sits before the catalytic converter and measures exhaust oxygen to help the ECU adjust fuel trim. Downstream (sensor 2) sits after the catalytic converter and verifies converter efficiency. Replacing both ensures consistent readings and avoids mismatched sensor aging that can trigger codes.

• Upstream: real-time air/fuel feedback for engine control
• Downstream: monitors catalytic converter performance
• Replacing both reduces false codes and diagnostic confusion
• Sold together to match response characteristics and service life

What should I expect during installation and maintenance?

Installation typically requires standard hand tools and an O2 sensor socket; lift equipment may be needed for access under the vehicle. Allow time for sensor harness inspection and using anti-seize where appropriate on threads to simplify future removal. If unsure, a qualified mechanic can handle installation in about an hour for each sensor location.

• Tools: O2 sensor socket, ratchet, penetrating oil, torque wrench recommended
• Time: roughly 1–2 hours for both sensors for experienced DIYers
• Tip: check wiring harness and connectors for heat damage or corrosion
• Service reminder: clear codes after installation and perform a test drive

Who is this for: The Sangyue 2X Oxygen Sensor kit is for DIY mechanics and professional technicians who own or service 1998–2002 Honda Accord vehicles equipped with the 2.3L F23A1 or F23A5 engines and need a cost-effective, direct-fit upstream and downstream replacement. It’s suited to buyers looking to resolve OBD-II oxygen sensor fault codes, restore smoother idle and fuel control, or maintain emissions system performance. Before ordering, check the vehicle selector (make, model, year, engine, and notes) to confirm exact compatibility. The product includes a one-year unlimited mileage quality guarantee for added purchaser confidence.