Delphi ES20161 Oxygen Sensor - Center, Rear, Rear Left or Rear Right

Delphi ES20161 Heated Oxygen Sensor Overview

The Delphi ES20161 is a heated oxygen sensor designed for precise emission control in select Nissan and Infiniti vehicles. Engineered with a 4-wire configuration and a square connector shape, this sensor ensures accurate air-fuel mixture readings for optimal engine performance.

• Heated oxygen sensor with 4 wires for reliable operation
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicles
• Overall length of 480.0 mm for correct installation depth
• Includes oxygen sensor and instruction sheet for installation guidance
• Position-specific fitment: center, rear, rear left, and rear right

Technical Details and Compatibility

The Delphi ES20161 oxygen sensor features a heated design that allows it to reach operating temperature quickly, improving sensor response time and reducing emissions during cold starts. The 4-wire configuration supports both the sensor signal and heater circuit, ensuring consistent performance. Its square connector shape and 18 x 1.5 mm thread size provide a secure and precise fit in the exhaust system. With an overall length of 480 mm, this sensor is designed to fit specific positions such as center, rear, rear left, and rear right locations on compatible vehicles.

This oxygen sensor is compatible with a range of Nissan and Infiniti models, including the Nissan Altima, Frontier, Maxima, Pathfinder, Sentra, Xterra, NV1500, NV2500, NV3500, Quest, and the Infiniti 350Z, FX35, FX45, G35, M35, M45, and Q45. The part number ES20161 ensures you receive the correct sensor for these applications.

Common Applications and Issues Addressed

• Helps maintain proper air-fuel ratio for efficient combustion
• Reduces engine misfires caused by faulty oxygen sensor readings
• Prevents increased emissions and failed emissions tests
• Improves fuel economy by providing accurate feedback to the engine control unit
• Resolves check engine light triggers related to oxygen sensor faults

Installation Notes and Tips

• Ensure the sensor is installed in the correct position as specified (center, rear, rear left, or rear right)
• Use the included instruction sheet for proper torque specifications and wiring connections
• Verify the connector shape matches the vehicle harness to avoid installation issues
• Inspect the exhaust threads and clean if necessary before installation to ensure a proper seal
• Allow the engine to cool before replacing the sensor to prevent burns or damage

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. The ES20161 part number undergoes rigorous testing to ensure accurate sensor output and heater function. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship to support long-term use in Nissan and Infiniti vehicles.