Standard Ignition AX91 Ambient Air Temperature Sensor

Ambient Air Temperature Sensor for Nissan and INFINITI

Standard Ignition AX91 is an ambient air temperature sensor for select Nissan and INFINITI vehicles. It uses a 2-terminal, plug-in design with a female connector, male blade terminals, and a black finish for direct replacement service on the vehicle’s HVAC system.

Key Features

• Ambient air temperature sensor for HVAC temperature input
• 2-terminal construction with 12-volt electrical specification
• Female connector with male blade terminals
• Round and square connector shape, plug-in attachment method
• Black color/finish
• Sensor only; wiring harness not included
• No mounting bracket included

Detailed Description

Standard Ignition AX91 is built for vehicles that rely on an ambient air temperature signal to support HVAC operation and temperature display functions. This part number is used across a wide range of Nissan and INFINITI applications, including Nissan Altima, Sentra, Versa, GT-R, Kicks, Murano, Maxima, Pathfinder, Rogue, 350Z, and Quest, as well as INFINITI Q50, QX50, QX60, Q40, JX35, M35, M45, FX35, FX45, and G35. It cross-references Four Seasons 76024 for the same application.

Standard Ignition AX91 is also referenced by part number 5S6114 and 72-4759 in interchange listings. Use this ambient air temperature sensor when servicing HVAC temperature input on Nissan and INFINITI models that call for this style of plug-in sensor.

What It Helps Address

• Incorrect outside air temperature readings
• HVAC display temperature errors
• Faulty ambient temperature signal to the climate control system
• Intermittent sensor connection issues at the plug-in terminal interface
• Replacement needs on aging Nissan and INFINITI HVAC sensor circuits

Installation Notes and Tips

Verify connector shape, terminal count, and vehicle application before installation. Standard Ignition AX91 uses a 2-terminal, female connector with male blade terminals and a plug-in attachment method. The sensor is supplied without a wiring harness or mounting bracket, so reuse existing vehicle-side components where applicable. Confirm the exact model year and application, especially on Nissan Maxima and INFINITI G35 listings with production-date notes.

Quality Assurance

Standard Ignition supplies this ambient air temperature sensor as a direct-fit replacement component for listed Nissan and INFINITI applications. The part is identified as AX91 for catalog and service matching.