NTK 25758 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Direct-fit oxygen sensor

NTK Oxygen Sensor 25758 is a specific-fit, heated oxygen sensor built for downstream applications. It uses a threaded mounting design and a 4-wire configuration to match the original equipment style used on select Mercedes-Benz, INFINITI, and Freightliner vehicles.

Key features

• Direct Fit Oxygen Sensor line for application-specific replacement
• Heated sensor design for faster operating response
• Threaded mounting type with 18 mm thread diameter
• 19.75-inch wiring harness length for proper routing
• 4-wire construction for the specified application
• OE-equivalent design for fit, form, and function

Detailed application overview

NTK 25758 is engineered as a downstream oxygen sensor for a wide range of import and domestic applications, including Mercedes-Benz Maybach S680, Mercedes-Benz Sprinter, and INFINITI Q50 platforms. The direct-fit design supports straightforward replacement where the original sensor uses the same threaded, heated, 4-wire layout. This part number 25758 is backed by NTK’s OE-focused sensor manufacturing and extensive production testing.

NTK is part of the NGK family and is known for oxygen sensor manufacturing across import and domestic coverage. The brand’s Direct Fit Oxygen Sensor line focuses on application-specific replacement parts that match original equipment requirements for fit and function. Part number 25758 follows that approach for downstream sensor service on the listed vehicles.

Common issues this part can address

• Fault codes related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Slow sensor response caused by age or contamination
• Exhaust monitoring problems after sensor failure
• Replacement needs after wiring or heater circuit wear

Installation notes and quality assurance

Install this sensor only on the exact applications listed in the fitment data. Confirm the downstream position, connector style, wire count, and thread size before installation. Use the vehicle’s service information for torque and routing details, and verify that the exhaust threads are clean before threading in the sensor.

NTK states that these oxygen sensors are extensively tested during manufacturing and built to meet or exceed OE specifications. The brand also positions itself as a major original equipment oxygen sensor supplier, which supports confidence in application accuracy and reliability for part number 25758.