Spectra Premium OS6138 Heated Oxygen Sensor 4-Wire Rectangular Connector

The Spectra Premium OS6138 is a direct-fit, heated oxygen sensor (O2 sensor) engineered to meet or exceed original equipment performance standards. Designed as a specific-fit replacement, this sensor restores proper exhaust gas monitoring and helps your vehicle's ECU maintain optimal fuel efficiency and emissions control.

How It Works:

The oxygen sensor detects O2 concentration in the exhaust stream and communicates the difference between exhaust gas oxygen levels and ambient air back to the engine control unit (ECU). This feedback loop allows the ECU to fine-tune the air/fuel mixture, protecting fuel economy, supporting smooth idle, and maintaining proper ignition timing.

Key Features:

• Heated sensor design — reaches operating temperature faster for quicker closed-loop feedback
• 4-wire configuration with a rectangular male connector for a direct plug-in fit
• M18x1.5 thread size with 7/8" (0.875") wrench size for straightforward installation
• Wire harness length: 395mm for proper routing without modification
• 20 AWG wire gauge for reliable signal transmission
• Anti-seize coating pre-applied to threads to prevent galling and ease future removal
• Protective cap included to shield the sensing element during shipping and installation
• Waterproof connector resistant to car wash spray, puddle splash, and dust
• ISO 9001 / TS16949 certified manufacturing process with 100% performance testing
• Screw-mount type — no special tools required beyond a standard O2 sensor socket

Manufactured in a dust-free, temperature-controlled environment using precise electronic components, the OS6138 is built to the same quality standards as OEM sensors — without the dealership price tag. The Spectra part number is engraved directly on the sensor for easy identification.