NTK 27051 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
NTK
 Direct Fit 5-Wire A/F Sensor

NTK 27051 Air / Fuel Ratio Sensor - Upstream

Brand NTK 27051
Position Upstream
Wiring Harness Length 33.5000
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 BMW · 13 vehicles

Direct-fit design. Specific application sensor for OE-equivalent replacement.

Heated sensor. Helps the sensor reach operating temperature faster after startup.

OE-tested quality. Manufactured and tested to meet or exceed OE specifications.

Cross-references 11787848482 for the same application. See all 1.

$157.66Free shipping
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Order total $157.66
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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 27051 is a specific-fit, heated air/fuel ratio sensor built for upstream applications with OE-equivalent design. It uses a 5-wire configuration and is engineered for direct replacement where the original sensor matches this application.

Key Features

  • Direct-fit, specific application sensor for straightforward replacement.
  • Heated design for faster sensor operation after startup.
  • 5-wire construction for the correct signal and heater circuit layout.
  • 18 mm thread diameter with 0.38 thread length.
  • 33.5 in. wiring harness length for proper routing.
  • NTK 27051 is tested during manufacturing to meet or exceed OE specifications.

Fitment Details

Fits 2021 BMW M2, upstream. Fits 2019-2020 BMW M2, upstream, cylinders 1-3, bank 1 sensor 1. Fits 2020 BMW M4, upstream. Fits 2015-2019 BMW M4, upstream, cylinders 1-3, bank 1 sensor 1. Fits 2015-2018 BMW M3, upstream, cylinders 1-3, bank 1 sensor 1.

This part cross-references BMW 11787848482 for the same application.

What It Helps Address

  • Fault codes related to upstream air/fuel ratio sensor performance.
  • Incorrect fuel mixture readings from a worn sensor element.
  • Slow sensor response during cold starts.
  • Signal issues caused by damaged wiring or connector wear.
  • OE-equivalent replacement needs for BMW M2, BMW M4, and BMW M3 applications.

Installation Notes

Verify connector style, thread size, and harness length before installation. This NTK 27051 sensor is a specific-fit part, so match the vehicle application and upstream location exactly. Mounting bracket is not included.

Quality Assurance

NTK is part of the NGK family and is a major original equipment oxygen sensor supplier. The sensor is manufactured and tested to meet or exceed OE specifications for fit, form, and function.

Related reading

This part fits 13 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2021BMWM23.0LL6UpstreamOE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2020BMWM23.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2020BMWM43.0LL6UpstreamOE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2019BMWM23.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2019BMWM43.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2018BMWM33.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2018BMWM43.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2017BMWM33.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2017BMWM43.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2016BMWM33.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2016BMWM43.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2015BMWM33.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2015BMWM43.0LL6UpstreamCylinders 1-3, Bank 1 Sensor 1, OE Equivalent Design; 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.
11787848482