Genuine Denso Air Fuel Ratio Sensor 234-5724

Ensure optimal fuel efficiency and emissions compliance with the Denso Air Fuel Ratio Sensor 234-5724 (SKU 22-854). This premium OEM-quality wideband pre-cat lambda sensor is engineered by Denso to accurately measure exhaust oxygen content across a wide air-fuel ratio range, providing critical real-time feedback to the engine control unit for precise fuel delivery, optimal combustion efficiency, and emissions control. Designed specifically for Honda FC/FK Civic with L15B7 engine and Honda RW CR-V with L15BG engine, this sensor ensures dependable engine management system performance and long service life for your Honda.

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Key Features & Benefits

• Genuine Denso Quality - OEM-grade component built to exacting standards
• Honda Civic & CR-V Application - Fits FC/FK Civic L15B7 and RW CR-V L15BG
• Wideband Pre-Cat Sensor - Upstream lambda sensor for primary fuel control
• Precise AFR Measurement - Accurately measures air-fuel ratio across wide range
• Optimal Fuel Delivery - Ensures correct fuel mixture under all conditions
• Maximum Fuel Economy - Precise feedback maximizes fuel efficiency
• Emissions Compliance - Maintains proper emissions control system operation
• Catalytic Converter Protection - Prevents rich running that damages catalysts
• Reliable Operation - Consistent performance in all conditions
• Long Service Life - Durable construction for extended reliability

Technical Specifications

• Denso Part Number: 234-5724
• SKU: 22-854
• Component Type: Air Fuel Ratio Sensor / Wideband Lambda Sensor (Pre-Cat / Upstream)
• Primary Application: Honda FC/FK Civic L15B7, Honda RW CR-V L15BG
• Weight: 0.2 kg (approximate)

Vehicle Compatibility

This Denso air fuel ratio sensor is compatible with the following Honda models and engines:

Honda Civic:

• Honda Civic FC (L15B7 1.5L VTEC Turbo engine)
• Honda Civic FK (L15B7 1.5L VTEC Turbo engine)

Honda CR-V:

• Honda CR-V RW (L15BG 1.5L VTEC Turbo engine)

Always verify fitment for your specific vehicle, model year, and engine configuration.

CLICK HERE TO CHECK IF THIS FITS YOUR VEHICLE.

OEM Part Number Cross-Reference

This Denso air fuel ratio sensor replaces the following OEM part numbers:

• 234-5724 (Denso)
• 365315K8004 (Honda)
• EGO-854 / EGO854

Common Symptoms of Faulty Air Fuel Ratio Sensors

• Check engine light with O2/AFR sensor codes (P0130, P0131, P0132, P0133, P0134, P0135, P2A00, P2A03)
• Poor fuel economy
• Rich or lean running condition
• Rough idle or engine hesitation
• Failed emissions test
• Black smoke from exhaust (rich condition)
• Catalytic converter damage from prolonged rich running
• Loss of power during acceleration
• Engine stumbling or misfiring

What Does an Air Fuel Ratio Sensor Do?

The air fuel ratio (AFR) sensor, also known as a wideband lambda sensor or wideband O2 sensor, is a critical component of your vehicle's engine management and emissions control system. Unlike a conventional narrowband oxygen sensor that simply detects rich or lean conditions, the wideband AFR sensor accurately measures the precise air-fuel ratio across a wide range — from very rich to very lean. Mounted upstream of the catalytic converter (pre-cat), the sensor provides continuous real-time feedback to the engine control unit (ECU), which uses this data to precisely adjust fuel injection quantity to maintain the ideal stoichiometric air-fuel ratio (14.7:1 for petrol engines). In turbocharged engines like the Honda L15B7 and L15BG, accurate AFR measurement is especially critical for maintaining safe combustion under boost conditions. A properly functioning AFR sensor is essential for optimal fuel economy, maximum performance, emissions compliance, and catalytic converter longevity.

Why Choose Genuine Denso Air Fuel Ratio Sensors?

Genuine Denso air fuel ratio sensors are designed to meet or exceed original equipment specifications, ensuring accurate wideband measurement, reliable operation, and long service life. As a world-leading automotive supplier and original equipment manufacturer for Honda and other major automakers, Denso engine management components are built to exacting standards with precision engineering and quality materials. Using genuine Denso AFR sensors ensures proper fitment, maintains your vehicle's engine management system integrity, and provides the reliability you need for worry-free driving.

Installation Notes

Professional installation is recommended for best results. AFR sensor replacement requires disconnecting the battery, locating the upstream sensor in the exhaust system (before the catalytic converter), disconnecting the electrical connector, and carefully removing the old sensor using an oxygen sensor socket. Apply anti-seize compound to the threads of the new sensor (if not pre-applied). Install the new sensor and torque to manufacturer specifications (typically 40-55 Nm). Reconnect the electrical connector. Clear any diagnostic trouble codes and allow the engine to reach operating temperature to complete the sensor's closed-loop learning cycle. Test drive to verify proper operation and fuel economy improvement.

Why Choose LM15 Motorsport?

We supply genuine Denso engine management components with fast shipping across Australia. Every air fuel ratio sensor is carefully inspected to ensure you receive an authentic Denso component for reliable engine management system performance. Our team has extensive experience with Honda Civic and CR-V vehicles and can provide expert advice on engine management system maintenance and troubleshooting.

Need help with fitment or installation? Contact our expert team for advice specific to your Honda FC/FK Civic L15B7 or RW CR-V L15BG air fuel ratio sensor requirements.