QIJIAUTO Oxygen Sensor 234-4099 (SG1861) Direct-Fit for Honda/Acura 1990s–2000s — Upstream/Downstream Replacement

The QIJIAUTO 234-4099 (SG1861) oxygen sensor is a direct-fit replacement sensor designed to restore accurate air-fuel monitoring for compatible Honda and Acura engines.

This aftermarket O2 sensor provides the electrical feedback your engine computer needs to correctly adjust fuel delivery and emissions. Manufactured to match the original equipment fit and signal characteristics, it connects to existing wiring and mounts in the factory location. The sensor is compatible with a range of Honda and Acura vehicles from the 1990s through the mid-2000s and lists multiple OE cross-reference numbers for installers and DIY mechanics.

Which vehicles does this sensor fit?

The QIJIAUTO 234-4099 is listed to fit many Honda and Acura applications across model years primarily in the late 1990s and early 2000s. Always verify compatibility with your vehicle’s VIN or the original part number before purchase.

• Compatible models include Honda Civic (1992–2005 variants), Accord (1998–1999), Prelude (1997–2001), Odyssey (1996–2000), CR/CL/EL/Integra/NSX and Oasis where specified.
• Cross-reference OE numbers: SG336, 234-4099, SG1861, 234-4363, 234-4620, 234-4092, 24243, 250-24121, SG581, 24426, 15406, ES20063.
• Confirm exact position (upstream/downstream) and connector style for your engine and exhaust configuration.

How will replacing the O2 sensor affect driveability?

A healthy oxygen sensor helps the engine control module (ECM) maintain the correct air-fuel ratio, which improves idle stability and fuel economy and prevents prolonged rich or lean running. When the original sensor begins to fail, you may notice a rough idle, decreased mileage, or a check engine light; replacing it restores proper feedback.

• Reduces rough idling and hesitation caused by incorrect air-fuel signals.
• Helps the ECM correct fuel trims for better fuel economy and emissions.
• Removes false or persistent OBD-II codes related to sensor failure when properly installed.

What are the product’s key features and installation notes?

This sensor is built for durability and stable output to match replacement expectations for older Honda/Acura systems. Installation is straightforward for technicians and many experienced DIYers, but allow the vehicle’s computer time to relearn sensor values after fitting.

• Durable construction intended for long-term exposure to exhaust temperatures and contaminants.
• Direct-fit design for bolt-in replacement with standard O2 sensor tools; includes compatible connector style for OEM harnesses.
• After installation the engine may idle roughly for a short period while the ECM recalibrates oxygen and fuel readings — this is normal and should clear after driving.

How do I confirm I’m ordering the correct part?

Match the replacement sensor’s OE cross numbers and compare the connector, thread size, and mounting position to your current unit. If your vehicle shows related diagnostic trouble codes or symptoms, confirm whether the sensor is upstream (pre-catalyst) or downstream (post-catalyst) before ordering.

• Check the original sensor for part numbers and connector pin count to match SG1861/234-4099 references.
• Use your VIN or consult a parts manual to verify model-year application specifics.
• If uncertain, provide the old part number or vehicle details to your installer for confirmation.

Who is this for: This QIJIAUTO 234-4099 oxygen sensor suits vehicle owners and mechanics restoring proper engine management on older Honda and Acura cars and light trucks. It’s intended for anyone needing an OEM-style replacement to address check engine lights, poor fuel economy, or unstable idle, and for service shops needing a reliable cross-referenced aftermarket sensor compatible with multiple model years.