NTK 27078 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
NTK
 Direct Fit 5-Wire A/F Sensor

NTK 27078 Air / Fuel Ratio Sensor - Upstream

Brand NTK 27078
Position Upstream
Wiring Harness Length 19.2500
Sensor Type Heated
Thread Length 0.38
Universal Or Specific Fit Specific
Wire Quantity 5
Thread Diameter 18.000
Mounting Bracket Included No
Product line Direct Fit 5-Wire A/F Sensor
Fits Hyundai and Kia · 16 vehicles

Specific-fit design. Built for direct application matching and consistent sensor replacement.

Heated sensor. Helps the sensor reach operating temperature quickly for emissions control.

OE-focused engineering. NTK tests each sensor to meet or exceed OE specifications.

Cross-references 3921003130 for the same application. See all 1.

$136.74Free shipping
In stock · usually ships same day before 1pm CST
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Direct-Fit Air/Fuel Ratio Sensor

NTK 27078 is a specific-fit, heated air/fuel ratio sensor built for upstream applications. It uses a 5-wire design and is engineered for accurate signal control in emissions management systems.

  • Specific-fit replacement for direct application matching
  • Heated sensor design for faster operating response
  • 5-wire configuration for precise signal handling
  • NTK OE-style engineering for fit, form, and function

Fitment Details

Compatible with 2021-2024 Hyundai Elantra, upstream; 2020-2022 Hyundai Ioniq, upstream; 2020-2022 Kia Niro, upstream; 2017-2019 Hyundai Ioniq, upstream; 2017-2019 Kia Niro, upstream.

This part cross-references Hyundai/Kia OE number 3921003130 for the same application.

What It Is Used For

  • Restoring air/fuel ratio sensor signal accuracy
  • Addressing upstream sensor fault codes
  • Replacing a worn heated oxygen sensor assembly
  • Supporting emissions system monitoring

Installation Notes

Verify connector style, thread size, and harness length before installation. The sensor is a specific-fit replacement and does not use a universal application approach. Mounting bracket is not included.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor supplier. Each sensor is extensively tested during manufacturing to meet or exceed OE specifications.

Related reading

This part fits 16 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2024HyundaiElantra1.6LL4FULL HYBRID EV-GAS (FHEV)UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2023HyundaiElantra1.6LL4FULL HYBRID EV-GAS (FHEV)UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2022HyundaiElantra1.6LL4FULL HYBRID EV-GAS (FHEV)UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2022HyundaiIoniq1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2022KiaNiro1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2021HyundaiElantra1.6LL4FULL HYBRID EV-GAS (FHEV)UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2021HyundaiIoniq1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2021KiaNiro1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2020HyundaiIoniq1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2020KiaNiro1.6LL4—UpstreamOE MFR: NTK; Direct Fit 5-Wire A/F Sensor
2019HyundaiIoniq1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
2019KiaNiro1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
2018HyundaiIoniq1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
2018KiaNiro1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
2017HyundaiIoniq1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
2017KiaNiro1.6LL4—UpstreamBank 1 Sensor 1 Oxygen Sensor; Direct Fit 5-Wire A/F Sensor
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
3921003130