OXYGEN SENSOR FITS HONDA ACCORD V6 CM CM6 2003-2008 4 DOOR 3.0 LITRE V6 24V OX783

Description

Maintain the engine management and emissions control performance of your Honda Accord with the OX783 Oxygen Sensor, listed for Honda Accord V6 CM-series four-door sedans manufactured between 2003 and 2008. This replacement component is intended for the specified 3.0-litre V6 24-valve petrol engine application and is listed as a pre-catalytic converter oxygen sensor.

An oxygen sensor, also known as an O2 sensor or lambda sensor, plays an important role in the engine management system. It monitors oxygen levels in the exhaust gases and sends information to the engine control unit (ECU). The ECU uses this feedback to help regulate fuel delivery and maintain the correct air-fuel mixture under different driving conditions.

When an oxygen sensor becomes contaminated, slow to respond or electrically defective, it may affect fuel-control accuracy and trigger the check-engine warning light. Replacing a sensor that has been correctly diagnosed as faulty can help restore reliable exhaust feedback and support normal engine operation.

Product Code: OX783

Vehicle Compatibility

This oxygen sensor is listed for the following vehicle application:

• Make: Honda
• Model: Accord V6
• Chassis series: CM – CM6 as supplied in the listing
• Model years: 2003–2008
• Body style: 4-door sedan
• Engine capacity: 3.0 litres
• Engine configuration: V6
• Valve configuration: 24V
• Fuel type: Petrol
• Engine family reference: J30-series, subject to vehicle verification
• Sensor position: Pre-catalytic converter – upstream application
• Product code: OX783

The Honda Accord CM-series 3.0-litre V6 was available with different engine and emissions configurations. Application information for the CM 3.0-litre V6 identifies the J30A4 engine, while other model years and versions may use different specifications. Confirm the engine code and original part number before purchasing to ensure the replacement matches your particular vehicle.

Key Features and Benefits

• Exhaust oxygen monitoring: Measures oxygen levels in the exhaust stream to provide feedback to the engine management system.
• Air-fuel mixture control: Helps the ECU regulate fuel delivery when the sensor is operating correctly.
• Pre-catalytic converter application: Listed for an upstream sensor position, subject to verification against the original part.
• Emissions system support: Contributes to the vehicle’s exhaust monitoring and emissions control functions.
• Replacement maintenance option: Suitable for consideration when diagnostic testing confirms that the existing sensor is faulty.
• Vehicle-specific listing: Intended for selected Honda Accord CM-series 3.0-litre V6 applications from 2003 to 2008.

Actual results depend on the condition of the vehicle, correct sensor selection and the cause of the original fault. Replacing an oxygen sensor does not guarantee increased horsepower, lower fuel consumption or the resolution of unrelated engine problems.

How the Oxygen Sensor Works

During engine operation, the oxygen sensor measures the oxygen content in the exhaust gases. The ECU uses this information alongside readings from other engine sensors to adjust fuel delivery and maintain appropriate combustion conditions.

The Accord V6 uses a banked exhaust arrangement, with sensors positioned at different points in the exhaust system. The upstream air-fuel ratio sensors monitor exhaust gases before the catalytic converters and provide feedback primarily used for fuel control. Downstream heated oxygen sensors monitor gases after the catalytic converters and help assess catalytic converter efficiency. Honda workshop information distinguishes these sensor types and their separate functions.

Because the sensors perform different functions, the OX783 listing should not be assumed to fit every oxygen-sensor position on the vehicle. Confirm that your existing component is the correct pre-catalytic converter sensor and check the connector and original equipment part number before ordering.

Common Symptoms of a Faulty Oxygen Sensor

A worn or malfunctioning oxygen sensor may contribute to several noticeable symptoms, including:

• An illuminated check-engine warning light.
• Increased fuel consumption.
• Rough or inconsistent engine idling.
• Hesitation during acceleration.
• Unusual exhaust emissions or a failed emissions inspection.
• Diagnostic trouble codes related to oxygen-sensor signals or heater circuits.
• Fuel-trim readings outside the expected range.

These symptoms may also be caused by intake leaks, exhaust leaks, ignition problems, fuel-delivery faults or damaged electrical wiring. A diagnostic scan and appropriate testing should be completed before replacing the sensor.

Installation Guidelines

Correct installation is important for reliable operation and to help prevent damage to the replacement component.

• Verify compatibility: Check the vehicle identification number (VIN), engine code, production date and original sensor part number.
• Confirm sensor location: Ensure the required component is the upstream sensor before the catalytic converter, not a downstream sensor.
• Allow the exhaust to cool: Exhaust manifolds and catalytic converters can remain extremely hot after driving.
• Inspect the connector and wiring: Look for corrosion, damaged insulation, loose terminals or signs of excessive heat.
• Remove the old sensor carefully: Use a suitable oxygen-sensor socket and avoid damaging the threaded mounting point.
• Install the replacement: Follow the vehicle manufacturer’s tightening torque and the sensor manufacturer’s installation instructions.
• Reconnect and test: Route wiring away from hot or moving components, clear fault codes where appropriate and verify sensor readings with a diagnostic tool.

Professional installation is recommended if the sensor is seized, access is restricted or wiring repairs are required.

Important Fitment Checklist

Before ordering OX783, please verify:

• Your vehicle is a Honda Accord V6 CM-series sedan within the stated year range.
• The engine is the correct 3.0-litre V6 24-valve petrol version.
• The engine code and production date match the application.
• The sensor is the required upstream, pre-catalytic converter type.
• The electrical connector, wire configuration, cable length and mounting thread match the original component.
• The VIN or original equipment part number confirms compatibility.

Important: Model-year ranges can include variations in engine management and emissions equipment. Confirm the exact sensor position and original part number before ordering to reduce the risk of selecting an incompatible replacement.

Conclusion

The OX783 Oxygen Sensor is listed for selected 2003–2008 Honda Accord CM-series V6 sedans equipped with the 3.0-litre 24-valve petrol engine. Listed as a pre-catalytic converter sensor, it provides exhaust feedback that helps the engine management system regulate fuel delivery and support emissions control.

If your existing sensor has been diagnosed as faulty, choosing the correct replacement can help restore reliable feedback to the ECU and support normal engine operation. Verify your vehicle’s engine code, original part number, connector and exact sensor position before purchasing to ensure the OX783 is suitable for your Honda Accord.