NTK 25215 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for Audi Q7

The NTK 25215 is a direct fit heated oxygen sensor built for specific applications and engineered for threaded installation. It is a fitment-based replacement for the Audi Q7 and uses a 4-wire design with a 44.25-inch harness length.

• Heated oxygen sensor with specific-fit application coverage.
• Threaded mounting type for direct replacement use.
• 4-wire configuration with 44.25-inch wiring harness length.
• 18 mm thread diameter for the listed application.

Detailed Product Overview

NTK 25215 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style fit, form, and function. NTK draws on its background as a ceramics manufacturer and OE sensor supplier to produce oxygen sensors that are extensively tested during manufacturing for quality and reliability. For 2011-2015 Audi Q7 downstream left applications, this sensor is listed as a direct fit replacement oxygen sensor for the B2S2 location.

Common Replacement Issues

• Fault codes related to oxygen sensor performance.
• Incorrect air-fuel feedback from a worn heated sensor.
• Emissions test failures tied to sensor response issues.
• Harness or connector-related service needs on the listed application.

Installation Notes

Verify the downstream left position and B2S2 location before installation. Confirm thread diameter, wire count, and harness length against the original sensor on the Audi Q7. The threaded design supports direct replacement on the listed fitment.

Quality Assurance

NTK states that these oxygen sensors are tested during manufacturing to meet or exceed OE specifications. The brand is recognized as a major original equipment oxygen sensor supplier, and the 25215 reflects that OE-focused approach.