NTK 27000 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Direct-fit air/fuel ratio sensor

NTK 27000 is a specific-fit heated air/fuel ratio sensor for BMW applications that require precise upstream mixture feedback. It uses a 5-wire design and a direct-fit configuration to match OE-style service requirements.

Key features

• Heated sensor design for faster operating response
• Specific fit application for straightforward replacement
• 5-wire construction for air/fuel ratio signal control
• 18 mm thread diameter and 0.38 thread length
• 38.5 in. wiring harness length

Detailed description

NTK 27000 is part of the Direct Fit 5-Wire A/F Sensor line and is built for BMW 750i, BMW 750i xDrive, BMW 750Li xDrive, and BMW M550i xDrive applications listed in the fitment data. This sensor is engineered for upstream air/fuel ratio monitoring where accurate feedback is needed for engine management and emissions control. The heated design helps the sensor reach operating temperature quickly, while the specific-fit layout supports OE-style replacement without universal adaptation. This part cross-references BMW 11788650474 for the same application.

What it is used for

• Replacing a worn or slow-responding air/fuel ratio sensor
• Restoring accurate upstream mixture feedback
• Addressing drivability issues tied to incorrect sensor readings
• Supporting emissions system performance when the original sensor fails
• Correcting fault codes related to air/fuel ratio monitoring

Installation notes and tips

Verify the connector, thread size, and harness length against the original sensor before installation. Confirm the listed BMW application and sensor position in the fitment data, including upstream right and upstream left placements where shown. Use proper sensor removal tools and inspect the exhaust bung threads before installing the replacement.

Quality assurance

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