Mando 18A1401 Air / Fuel Ratio Sensor - Upstream

Mando Upstream Air/Fuel Ratio Sensor

The Mando 18A1401 is an OE replacement upstream air/fuel ratio sensor for Hyundai and Kia applications. It monitors exhaust oxygen content to help the engine control module maintain the correct air and fuel mixture for combustion, idle quality, and fuel efficiency.

Built to factory precision specifications, this Mando New Original Equipment sensor is a direct-fit choice for drivers replacing a failing upstream O2 sensor on select Hyundai Elantra, Kia Spectra, and Kia Spectra5 models.

Key Features

• OE replacement upstream air/fuel ratio sensor
• Factory precision specifications for original-equipment style fit and function
• Helps the engine manage air/fuel mixture for combustion control
• Direct replacement for select Hyundai and Kia applications
• Part number: 18A1401

Detailed Description

Mando New Original Equipment sensors are built for drivers who want an OE-style replacement that matches factory requirements. This upstream sensor is used by the engine management system to monitor exhaust oxygen levels and support accurate fuel delivery. For fitment-based searches, this part is a direct replacement for a 2003-2009 Hyundai Elantra upstream oxygen sensor, a 2004-2009 Kia Spectra upstream oxygen sensor, and a 2005-2009 Kia Spectra5 upstream oxygen sensor. The 18A1401 is also a practical match when searching for a Hyundai Elantra O2 sensor replacement or Kia Spectra upstream air/fuel ratio sensor.

This part cross-references Hyundai 39210-23900 and Kia 39210-23900 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough or unstable engine idle
• Poor fuel economy from incorrect air/fuel readings
• Hard starting caused by inaccurate sensor input
• Reduced engine efficiency on affected Hyundai and Kia models

Installation Notes and Tips

Install the sensor in the upstream location specified for the vehicle application. Confirm connector style, thread engagement, and routing before installation. If the original sensor has high mileage or contamination, inspect related engine management components and clear diagnostic trouble codes after replacement.

Quality Assurance

Mando New Original Equipment parts are produced to factory precision specs for OE-style replacement performance. The 18A1401 is intended for Hyundai and Kia owners seeking a sensor that aligns with original equipment requirements.