DENSO 234-5155 Air/Fuel Ratio Sensor 5-Wire Direct Fit Heated

The DENSO 234-5155 is a direct-fit, heated air/fuel ratio (AFR) sensor engineered to OE specifications as a precise replacement for the original sensor. As a wide-band oxygen sensor, it measures exhaust gas oxygen content across a broad range of driving conditions, delivering real-time air/fuel ratio data to the engine control unit (ECU) for precise fuel management.

DENSO helped pioneer air/fuel ratio sensor technology and has supplied AFR sensors to OEMs for decades. This aftermarket replacement is built to the same standards as the original equipment part, ensuring reliable performance and a guaranteed first-time fit.

Key Features:

• 5-wire heated design with a 17.87-inch wire harness for proper routing and direct plug-in installation
• Wide-band sensing range measures air/fuel ratios from approximately 12:1 to 19:1 for accurate ECU feedback across all RPM ranges
• Quick-response planar zirconia element rapidly detects oxygen concentration for faster closed-loop control
• Tarnish-proof platinum electrode resists degradation for longer service life and sustained accuracy
• Aluminum-oxide trap layer protects the ceramic element from silicone and lead contamination
• Double protection cover maintains proper sensor temperature and shields the element from exhaust contaminants
• Stainless steel housing provides corrosion and contaminant resistance for long-term durability
• Direct OE replacement — no modifications or splicing required

By maintaining an optimum air/fuel mixture, this sensor helps maximize engine performance, improve fuel efficiency, reduce harmful emissions, and extend catalytic converter life. DENSO manufactures and tests every AFR sensor to strict OE quality standards, making it a trusted choice for professional technicians and DIY installers alike.