DENSO 234-5747 Wideband Air/Fuel Ratio Sensor (AFR Sensor)

The DENSO 234-5747 is a direct-fit, OE-identical wideband air/fuel ratio sensor (AFR sensor), also known as a wideband oxygen sensor. As a founding innovator of AFR sensor technology, DENSO supplies this sensor to vehicle manufacturers at the factory level and now offers it as a precise OE replacement for the aftermarket.

Key Features:

• Wideband sensing technology: Monitors air/fuel ratios across a broader range than conventional narrowband oxygen sensors, enabling the ECU to make precise fuel trim adjustments under a wide variety of driving conditions
• Quick-response planar zirconia element: The compact planar design integrates the heater and sensing element into a small, flat tip for faster light-off and more accurate oxygen concentration readings
• Aluminum-oxide trap layer: Protects the ceramic sensing element from silicone and lead contamination, preserving platinum electrode accuracy over the long term
• Double protection cover: Maintains optimal sensor temperature for rapid response and shields the ceramic element from exhaust contamination
• Stainless steel housing with porous PTFE filter: Resists corrosion and moisture intrusion while allowing reference atmospheric oxygen to reach the sensing element
• 100% quality tested: Every sensor is checked for high-temperature signal output, air tightness, electrical continuity, and heat resistance before leaving the factory
• First Time Fit® design: Precision-built to OE specifications for a direct, no-modification installation

The DENSO 234-5747 AFR sensor delivers accurate exhaust gas feedback to the engine management system, helping optimize fuel efficiency, reduce harmful emissions, and extend catalytic converter life. It is the same sensor trusted by vehicle manufacturers and is an ideal replacement when diagnostic codes, rough idle, reduced fuel economy, or driveability issues point to a failing upstream air/fuel ratio sensor.