NTK 27009 Air / Fuel Ratio Sensor - Upstream

Direct-Fit Air/Fuel Ratio Sensor for Jeep, Ram, Fiat, and Chrysler

NTK 27009 is a direct-fit heated air/fuel ratio sensor built for specific upstream applications. It uses a 5-wire design with an 18.25 in. wiring harness and an 18 mm thread diameter for OE-style replacement on select Jeep, Ram, Fiat, and Chrysler models.

NTK Direct Fit 5-Wire Sensor Line

NTK’s Direct Fit 5-Wire A/F Sensor line is built for exact application coverage and OE-style integration. As part of NTK’s sensor-focused product range, this sensor is engineered for import and domestic vehicles where precise air/fuel feedback is required for engine management.

Key Features

• Part number: NTK 27009
• Heated air/fuel ratio sensor
• Specific fit for direct replacement
• 5-wire configuration
• 18.25 in. wiring harness length
• 18 mm thread diameter
• 0.38 in. thread length
• Upstream position application
• No mounting bracket included

Detailed Description

NTK 27009 is an upstream air/fuel ratio sensor designed for select 2014-2020 Jeep Cherokee, 2018-2020 Jeep Compass, 2015-2020 Jeep Renegade, 2015-2020 Ram ProMaster City, 2016-2018 Fiat 500X, and 2015-2017 Chrysler 200 applications. This sensor is intended for Bank 1 Sensor 1 locations and is built as a direct-fit replacement to match the original sensor connection and mounting style. NTK manufactures oxygen and air/fuel sensors with controlled ceramic technology and extensive production testing to support OE-level fit, form, and function. This part cross-references DENSO Auto Parts 234-5150 and 68195741AA for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air/fuel feedback to the engine control module
• Rough idle or drivability issues tied to sensor signal errors
• Fuel trim faults caused by a worn or slow-responding sensor
• Emissions test failures linked to sensor degradation

Installation Notes and Tips

• Verify the vehicle uses an upstream Bank 1 Sensor 1 location before ordering.
• Confirm connector style, harness length, and thread size against the original sensor.
• Inspect the exhaust bung threads before installation to ensure proper seating.
• Use the vehicle service procedure for sensor removal and torque specification.
• Clear diagnostic trouble codes after installation and confirm live data operation.

Quality Assurance

NTK sensors are manufactured and tested to meet or exceed OE specifications, with production controls focused on consistency and reliability. NTK is a major original equipment oxygen sensor supplier, and this part reflects that OE application focus.