NGK 23531 Oxygen Sensor, Heated 4-Wire Downstream O2 Sensor, 18mm

The NGK 23531 oxygen sensor (also called an O2 sensor or lambda sensor) is a heated, 4-wire, direct-fit replacement sensor for the after-catalytic-converter (downstream) position. It gives the engine computer constant feedback so the air-fuel ratio stays correct. It also helps the OBDII system watch catalytic converter efficiency, so it supports fuel economy, engine performance and lower emissions.

Key Features:

• Heated, narrow-band oxygen sensor with 4 wires
• Threaded mounting with an M18-1.5 thread (18 mm) and a 7/8 in. wrench size
• Wire length of about 18.25 in. (457-465 mm) with an OE-style connector
• Wiring harness included, which allows direct plug-in installation without cutting or splicing
• Integrated heater brings the sensing element to operating temperature quickly for faster closed-loop activation and lower cold-start emissions
• Dual-coated platinum element and ceramic element overcoat for quick response and longer service life
• Housing with a porous PTFE filter lets atmospheric oxygen in while keeping out water and engine grime, and protects the element from silicone and lead poisoning
• Built to OE standards, with connectors and attaching hardware specified by the OEM

Cross-references: Bosch 13687 and 15513, BWD OS2229, CARQUEST 75-3008, Chrysler 5139021AA, Delphi ES20090, DENSO 234-4768, Spectra Premium OS5255, and Standard Motor Products SG1396.

NTK is NGK's sensor brand and a leading original-equipment supplier of oxygen sensors. This sensor restores proper fuel control and helps the vehicle pass emissions testing.